Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42b1d1845c50abc…

MALICIOUS

PDF

94.8 KB Created: 2021-08-01 01:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 5ae3ce2fae7308b9b6ce9441789008b9 SHA-1: d7f04a0636d0f3f6111501b260bb1a69b889079e SHA-256: e42b1d1845c50abcfb19298732e53e7bc7c78572316750f4fb141418eb989593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign. No scripts were extracted, but the overall structure points to an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://quatcongnghieput.com/uploads/files/tulijasufeziwutinedovi.pdf In PDF document text
    • http://struttur-arch.it/userfiles/files/momesiso.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1fb9edf0i6o67kk41lfqisvav2/fipevow.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/zofos.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/72fa68f809477d29ab3ddb11bdbf0ff0/54604037416.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/9f3e66e3dab6b1ac35e453766284ddf2/13132058115.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0738002ee75abcfc87ff8af6fb0032ac/44960644617.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c1451192---taripifogexagi.pdfIn PDF document text
    • http://proxima-online.it/public/file/48376542208.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608606302d01d---kalajirumegiluvonaxovupa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5e87d11e---96326443797.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a017c7dcd2a---7329564817.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/68165625233.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/kukanexeliw.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/49449931326.pdfIn PDF document text
    • http://rjt1.org/upload/files/punadexizagotez.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce65482d0d---bisexeju.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/gibamidikosud.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/31180086955.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/jajepemogixozefi.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/11326373015.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/52725660122.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/47270110203.pdfIn PDF document text
    • https://rosycaffe.com/file/sogizelu.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/malagikomijonadup.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac726436bd6---wiwabudumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sentences+exercises+with+answers+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 18044 bytes
SHA-256: 78bd58ab595929f46a99f7614dfb78a681aa3bb8a00a83a427b8d0297f97a1ec
font_01_sfnt_off00013a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001525a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525A 10812 bytes
SHA-256: b0afcde3381688229d513aa459be7151d1a1bfc9902f7ae3daae6db530a60260

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