Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d00e2fdbd7af44…

MALICIOUS

PDF

91.7 KB Created: 2021-08-04 15:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 94feed8b3baf846cca06a711d69e6d30 SHA-1: 6416b7a6456aec6c5bb19424b321b75576d19452 SHA-256: 41d00e2fdbd7af440723f31485216d6256a490eeadee03b4125047c05079b3e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised CMS uploads. While no scripts were extracted, the presence of numerous URLs and the 'link farm' heuristic suggest the primary intent is to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://yaqeen-eg.com/userfiles/file/39736822427.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1cdacd22---64048337865.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/36504704897.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/t033o4hn10do09b6694tad29ia/jeregitetogezebidi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8290f4f3a5850cccb502659b1c213817/jevusiwuzip.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090b2df2ab48---xeloju.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/rebuk.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d4fa71154c594f5227a1bcf4ae5438be/megopotuparovug.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/bakapizonajifa.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c1211cc0f---13258314641.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/58df59a364a8027f3f6bb2864ae766f1/lidalimog.pdfIn PDF document text
    • http://rc-modeller.se/images/file///vikufepofizoguxonogon.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/zuzitelaremufovixuvov.pdfIn PDF document text
    • http://lactopad.com/uploads/files/45885381197.pdfIn PDF document text
    • http://temple.mo/userfiles/file/lezem.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021630104255.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/mijumekunozule.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77245a18b1---zubukogomidikiju.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/77399178670.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/cjmvjbj170k4476a8rf0hel155/75744357554.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/70146154975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=topologia+de+red+arbol+ventajas+y+desventajasPDF 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_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10980 bytes
SHA-256: 6b82d02d302e36a0b9a988915aa8595a054f6625b6f59ce643f84a266a0a7d34
font_01_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 18260 bytes
SHA-256: 08fd36d4a500acff68250ff3cb4916ed6b8ad4d5c34b389637888cec7ea93bee
font_02_sfnt_off000147ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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