Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d1e3a3b818191a…

MALICIOUS

PDF

100.5 KB Created: 2021-07-18 11:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 412fff6cb99e838e4b7ad3d9b5bf4298 SHA-1: 1169f7e3a75f991e810064b31607a60dcdbf0250 SHA-256: 46d1e3a3b818191aaf14c33ccf920a26cfd1b92ee2978aaa5d847e207aa5544c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show the document's purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://foto-preiss.at/upload_files/files/gugej.pdf In PDF document text
    • https://epiphanych.com/images/file/wevipe.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/32365658617.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5b81de3fdb9b3dad2af569165ba5be37/bufonazutetutunawowadi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/bq7l5h6np5ejb4t2f6qollj9pj/79447827724.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/silulivugixotaboderagak.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/64040903839.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/nofomel.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216201549153351.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3889c8102---99854626155.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fe4ac22dcb3b84e9ce9addb3f2139203/namawojukanifujakosekibod.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c0817b1a7---50609030489.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/3de90ff150ae970b1ec0570573813b69/tatefotetesisev.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/69493209331.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c16434311f---lanarugajewifirukuxix.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/dafadubirelenekurar.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/xojevugekuvatezujeve.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f059caa3b3---32962868082.pdfIn PDF document text
    • https://schmitz.cz/res/file/78479902052.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/86951299326.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c0eb61b9e4b42828d7859647d573f373/zalebibav.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/68409977031.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/wofase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pumpkin+muffins+with+chocolate+chipsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 19036 bytes
SHA-256: c8b941df1aa7e4a91c6fb2de8808746a96f7d26e6f99cea5f8c8134214b1cb6a
font_02_sfnt_off0001512d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512D 10924 bytes
SHA-256: e7fdfc2d98afe2bd110204db51615c606fe2fda0deb6c9809d0867b4ee28294e
font_03_sfnt_off00016a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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