Malicious PDF — malware analysis report

Static analysis result for SHA-256 d641b1daf3004c40…

MALICIOUS

PDF

82.0 KB Created: 2021-07-13 05:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8dee6e5e7f15a4dcd59fb7bc60572883 SHA-1: 2222a158a523ab106a4d987b208245f11d821ec5 SHA-256: d641b1daf3004c400260a070bc0ea55abb4cfad47ea2147342f7e31c3df38acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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.
  • 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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160965e6131fda---22612527148.pdf In PDF document text
    • http://nextgenship.net/upload/file/20210621162428328931.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/5aee74a70e4ee723822d00ea078a5339/12664579380.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/52670681002.pdfIn PDF document text
    • http://cwesp.biz/upload/file/50791315118.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/86102223024.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/176aaff82290f2ce7a0da78df35cba98/ladawajabebajozuz.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/tuliguvofopelugiminute.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/sejerajukediz.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/jexujawubelubezupe.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8791f39ac---11137378499.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/17769683771.pdfIn PDF document text
    • https://laser123.com/geektic/files/kakesikumasu.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/revukowowanaloj.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/17615369899.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/62215247272.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/zajomavetiwer.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe4bb92682---32297852794.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621426727.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8434b51ab6---mimufosexovitabazowumomuk.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8271e174---25663325105.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af825497e22---49512487999.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/16955996066.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/mawufifowejemafifagaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=proportion+word+problems+6th+gradePDF 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_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 17336 bytes
SHA-256: ee88930f3eb597e3a94a5479e33b96f830b6f8b8b8dfc6d182deaed69ce43196
font_02_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 11236 bytes
SHA-256: e9466251a3070942511cdfa5336cc26a6e10e9fcb7d69d7fa3ff4076f3e650e3

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