Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ce823aa27aa22f…

MALICIOUS

PDF

72.4 KB Created: 2021-07-20 08:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0adaaa05f56b7a5d33e0ec673f971791 SHA-1: 10b3ca4f493fc4017b1553925375219620736d5f SHA-256: 96ce823aa27aa22fc20b29e38065a3fe85a22875b753eeb66f7f219129232bfe
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The embedded URLs are likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098a43ba8328---zoxuzikuratapi.pdf In PDF document text
    • http://promocode.lu/userfiles/files/11347566860.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c727b877c7---28692616073.pdfIn PDF document text
    • https://ienter.bg/files/mugolum.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/42867821548.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/nijoxusasefukelazosuvosej.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/89579462073.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800591b3b8b---gawusosukesebaresoberiri.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/43331368278.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/magotekademoliladaxakuj.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6930ea6b98---63952417818.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a9510924cb75b12aab6d483407523883/79493316666.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7f82081a---jovuguxijutafodug.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/r3k2hk1hdt1b45uur58qub5ub7/16824325781.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nuzanorexitapi.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210529233039670741bx329d.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/13176947518.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/zejexunolum.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/60709289216.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/50076200637.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/valoxumedeb.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1020d01de---voxigigufojejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=astm+a182+f304PDF 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_off0000bb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB44 10516 bytes
SHA-256: 9306b77c8f4f2ba6606c34b1c996c02e4ff285a690974b158ca47256317eb183
font_01_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 16100 bytes
SHA-256: 51d954cacda6180dd76944c2f2961ff4b2ccb6d600b8b7ce7b10cfda5edd34fc
font_02_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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