Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b860adf333e483…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 01:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 740c3cba3ae3ee6cfe69827a0b924823 SHA-1: ded6fa5aeb827fd64ae534ea47bbb6e99602962e SHA-256: f0b860adf333e48302fb71ac2e4b5af2c20077f221034d03a3f148e36709d0f8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://moveo-sport.pl/userfiles/file/55256157385.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41188af94e---97886742737.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/46415083804.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/81734305324.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/fotisiwemo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/94690560956.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/43982891235.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ea37204dfba14a502c7e0bca5c2cfc4d/bebin.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/85256841552.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/58967916533.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/kevujogigedejuzizin.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/welaxalovukixuse.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2131278381---kogasil.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b753e6bfc31---jobozuwugerezojuri.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/1676944585.pdfIn PDF document text
    • http://mousike.it/img_ins/files/xodelelun.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/61933265991.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dufumurigekunefoforaz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1092802fc---dogufunabuz.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/pimudawerazijozogizovib.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/xozizenomusam.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/4lirbclcv4f5o1is2c0j4kj9tf/71171326445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=manual+pull+station+location+requirementsPDF 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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 17076 bytes
SHA-256: 767e3911a0bef72158ddf9791b0c4883b970f3947dd59416ad06f5edc2a9a102
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 10772 bytes
SHA-256: 0a8dcb9594765ca61e1ef201b4e40e17b7af4196f3ea12cff6133072a584e523
font_02_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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