Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d76c46e0f04b815…

MALICIOUS

PDF

82.6 KB Created: 2021-07-21 08:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f008fbce28fe8259ddd63b4628607b5 SHA-1: 69f6ee11adca79a72a1118c6a20d4260b9e50077 SHA-256: 5d76c46e0f04b81568a98972dae5834c1653b78e5d8f5d46a9151fbcebb9b51a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/86d5fa763297841c1c433bb250fcfff8/43131395407.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcba493065---xazimidebifovibefanusibix.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/9f27a0d7987914dc11df36ab3a270244/gopesoweduw.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b0e0ac51---48626794415.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ded8a62ed---85214280532.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb17de17b---naderamilokofosotevibu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/or8o4i2fqundt2rd965ubiv5hb/52496471510.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/sagemusutisatafazuv.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/19157e8b8448fc1b26b7c0a76bd87234/83672390150.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/14459692475.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b77ehrg7vnt652m8kpplmhnmr6/37127502619.pdfIn PDF document text
    • https://ahha.az/userfiles/file/6842344035.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f13a8db87f---pawuma.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/98375557757.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/gefojugidokuje.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/71046057809.pdfIn PDF document text
    • https://aokman-drive.com/d/files/dexemul.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dr2vktivspboe7ho4mlb36nq73/31189530942.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/noxabafovapopanilulowoxal.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/pqssveao10u8mjd1a2go6qlm94/30722735084.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jovoxukozap.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2825aa76794e299d7f058651be646459/56250067179.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2bd351657---wakavanawozikefita.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/63105298115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=playing+card+games+for+3PDF 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_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 16828 bytes
SHA-256: d035771b8e274fb1f93baba90c82df25271afac4cfec385d44eee023d2131bee
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 11008 bytes
SHA-256: 37eb2dc898cdc8cd1579d7c0a88404213f6aebff6b9628eb46143b92cfbcb1d3
font_02_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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