Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ab09c425d92561…

MALICIOUS

PDF

95.8 KB Created: 2021-08-15 11:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7496e15db028ae1d89842d198ae87df SHA-1: 1429d3790a26650c5355beeb4e205c585fdd5dc0 SHA-256: 39ab09c425d92561add195bdedc078e25447fdbda0af38237925219d8df3656c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gnfjg88vr4r0t0rrla03ppuaed/nozivuvoxawur.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ziconiavip.com/uploadfck/file/mubafedojarujepivokaxuvad.pdf In PDF document text
    • http://bogelaipigeon.com/upload/file/vinogew.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/87407337776.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/pebevirebanafesemafuvu.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/89294561147.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/zemekikosodiromapebegu.pdfIn PDF document text
    • https://mbbs.hr/files/jewezududuxovizativimenoz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a84168600d5537b1c1b7d01d1c38703/21500687386.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pewew.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/supoteraguzibix.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b16065a82---70388530211.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d85517855dab481f2e344ad835686c62/fetijuzezegavurozogip.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kofuguturevikoworipo.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///fatelezusanusudor.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ab218bda330b7093f3278dd9e1ac07f6/45545166675.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/57615161011.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/narawiranazilizidewugoxog.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/65604826159.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608609e5d1807---zadojatanogew.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/luviz.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gnfjg88vr4r0t0rrla03ppuaed/nozivuvoxawur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=world+of+warships+legends+xbox+one+codesPDF 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_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12646 11124 bytes
SHA-256: f74085eb1b4e78d167bb6b0ecf6705e8778795117cb64a43b86a50a53c624270
font_02_sfnt_off00013fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC3 19448 bytes
SHA-256: 5aef461246445df06260565eca4fd1d46c5915ab73b86d38474569707acc9fb3

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