Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7a90d0b78a2bd6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 09:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6b477de023770cdf629503eff7f10e3 SHA-1: 74202a98c86f349bcbb8cadb11a409f496272c6d SHA-256: 8a7a90d0b78a2bd6645ce414b41b3edb94362c3768376cebe673bc1653da8116
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://foodchemsino.com/d/files/kugifigeneriwodipes.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/58392076845.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/8031irbsipbb6fagh2gn206t79/29927861226.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ht9e0fp3g40ipujh7sm0agn2iv/givurapamef.pdfIn PDF document text
    • http://bscartridge.com/pic/10005090788.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/70551492542.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/zonabuwagelibe.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/725a1f7c880aad68da068bdbd34d5ec5/gixisunufiwid.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/senopabufopuja.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fc3c52981b327bce6775ea4d0a40ae84/kowatakadipolofizimo.pdfIn PDF document text
    • http://ezibra.pl/upload//file/xufukalorawepapev.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/roxazezekujadijizeduxijax.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/jubimodudifisolefuteninol.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/soxezerisojotobigi.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/89923638937.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611b88699fabb---kazasokekenikafome.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/e80c6f103fe93626a165bfa497ec3b19/85473266317.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/kja93rg7qhspar0gqnm2rgf6ih/sazutuzejewomexofupelebed.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab0be1bae---defuzuxazaxazokid.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b274106e1c---bupawegofirumutiburedoj.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/68322535719.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/39270381741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=types+of+sentences+and+examples+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 10768 bytes
SHA-256: 5f966d4aa218e09e3415cf354ca0349e8810adeec68c9de255c104678b6d1532
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 17676 bytes
SHA-256: 1ef90fa7f569f98b14700126693e86654eb0c2e01b259197b1d6d50edc09e822

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