Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9b7876727c5887…

MALICIOUS

PDF

88.5 KB Created: 2021-08-23 19:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb9b7ec29ba5e825ccf69d6123019b33 SHA-1: a56e2ae987d82e56bad61b0dd3cbb7ef9dc0352a SHA-256: 5a9b7876727c5887ffc971e08509a8917f08cd558e67e31af3e61ae5cd95765d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to host and distribute further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using disposable or compromised hosting for malicious links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0c2ea210---27701472232.pdf In PDF document text
    • https://jager-ig.tw/up_photo/file/bajiwurarukuxodeni.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/3j10vpksp1k90vn0mbfvheet0k/riwazemulezewojodolaj.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210811145315.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/maxogapedafav.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/13868113707.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/58336970343.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/28917199346.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a918181602c4b29e49e0456e915cedc5/17336466938.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/bopetasuzikobeleg.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/buzerudinapuwolefevote.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1629586189.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6919e5b387e00923428af9b30655a0e0/xojobemenobififurob.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/elqtebr01tadp21r1jppvgk221/nupegakobinomototegu.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da534aea53---bonadevobis.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/c23o88ev3rvine6j6daqkb15cs/45225747068.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/deweba.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd46ed2cee---79382480650.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/52b383919e58d30c0aef3fdfebbada4a/zomelunufo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d082da3d4---wudosojijapirowabosamon.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bd451173e---niwawirawatufowolajewanew.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bd27f00e87e7d668fc9557820bc3c20c/64126940041.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f85131e92a82afaebc656e361dc9abf5/9182163609.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/jasalegoxela.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a5d71132a8db61a753e416491dcc5348/45844325045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=resignation+letter+with+immediate+effect+samplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 11200 bytes
SHA-256: e8ebf3ff0865b32238f5899d67e0de40d5ff32bd281fec44ab289870133f1918
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16436 bytes
SHA-256: 51831beba8db9257790ae1968f0494672aea54e2b0a5bec276d423beaddd43d1
font_02_sfnt_off00013a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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