Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d2f557d69bddc5…

MALICIOUS

PDF

82.9 KB Created: 2021-08-07 14:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cad3cb48a924334a14dd4cebbe11e794 SHA-1: 04b5ae6d4b00b5788990b7293bd721586fb97d04 SHA-256: 90d2f557d69bddc5e03158b2fede178193cf6d2dca711121b5c55cc03a571de1
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal multiple links pointing to compromised WordPress sites and a raw IP address, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are designed to redirect users to external resources, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe64775b27---5043400332.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/melekemupadaxeg.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6d4b8838---22946118288.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/70687587512.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/xebobajetegu.pdfIn PDF document text
    • http://nenorm.com/files/files/84272024210.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/lajagabu.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/93898972783.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f6df27a3---fudidetoxubajujo.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/8881999523.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/44773637196.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/xanivagi.pdfIn PDF document text
    • https://hiroyoung.com/data/files/duverubis.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731f9ad3339---gomovujijogoki.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/90845809689.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085577f14a57---30346303555.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/sokupetutasu.pdfPDF link annotation
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609200edcb83e---refewabiwobumobemat.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f8d5ac647b7aac9885490dea66cd82f5/44929511371.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/54ad7ad9bc44e8d6bff3f42774678a5c/febobinav.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/bezekazepadeluf.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/27375113028.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ab14343d---gubosutivugogorumil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+set+up+spri+premium+pull+up+barPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5c7c0bb41ef6565c77bbcfae5584deb4/95348821157.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 16936 bytes
SHA-256: 4389f5901ae36ab22e4685d9dcd2fd56b1f793d781368738e0eee620bec4fc61
font_02_sfnt_off000125c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 10628 bytes
SHA-256: 7877696e57d9f969543eb153915bbc06b8eb93fa2a8a3f9389aeea797f68d1ea

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