Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfc879b95e07e30…

MALICIOUS

PDF

110.7 KB Created: 2021-09-04 07:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa86320911b5e2d15033fa0a8c59b950 SHA-1: 9a06f8f86bda7bae3ea22b50bbe280289770620e SHA-256: 8cfc879b95e07e30aa009e77ff7ba9d1f7d04acfbe268f99bc5f89e27e40dcac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple link farms and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to obscure the final malicious destination or to leverage SEO tactics for lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=girija+kalyanam+novel+pdf+free+download PDF link annotation
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6f04a6423947d7ef4c00fb4b9b699f9a/guliru.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/85382673999.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8svcq9vq58sfoqkilhoq2439c2/45537157290.pdfIn PDF document text
    • https://blogsma.com/files/nezimikupuvum.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6d295cf806cce379b54e2abd0632a208/27065569885.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/99864332254.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/47051521839.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089321e78281---23830048762.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/xuzaleguluvizosabofof.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160797bc7567b2---lusufovoloj.pdfIn PDF document text
    • http://vhshf.de/File/99986097238.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/jewoxebome.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/23552761659.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/pafofagusepanojijos.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/gbm66faju9srukuce4aajo72lr/wujeruwunu.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/detonebadofaj.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3anc767or4nmm7abhcjv5mba65/beduwigasiv.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/17546523173.pdfIn PDF document text
    • http://plncse.hu/php_data/file/torigagazipuxuwufibemon.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/5955335256.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/tixusafizekejexafibo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c137af4c1ab---42076980017.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/268977adff03d2ad4660e252afb031cb/90540056172.pdfIn PDF document text
    • http://www.toptehnik.si/images/71056451241.pdfIn PDF document text
    • 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_off00014210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14210 10920 bytes
SHA-256: f11b67ace4203ce5f0e1a8166a078e09c0b1602796fbe0fe7ad177d14af83d5e
font_01_sfnt_off00015b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B4D 21804 bytes
SHA-256: 08325bfca8b68ff2f625277859db91d0e6e63389d87f6182be383a9b78be375e
font_02_sfnt_off00019483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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