Malicious PDF — malware analysis report

Static analysis result for SHA-256 147fe60f79a4f0ba…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 14:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23bf4dcdffa294927c89be3921e72451 SHA-1: 275aefde5c0f08f69f5f8f47e59e24f77d79ba90 SHA-256: 147fe60f79a4f0bacb62969e5cabb4b0dc9128ea044c76f8ac71cadd10082c6d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pogologistics.com/ckfinder/userfiles/files/merawud.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0i1crtvuvcsa6br1r05e6cff7t/nasekufirutisafuvezoso.pdf
    • http://mdsalon.ru/img/lib/file/55819541528.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a43ce944024e09c1a6232f37e7c88baa/38302921801.pdf
    • https://discovery99.com/userfiles/file/70273742817.pdf
    • http://zekejozsef.eu/FCKfeltoltott/file/zomovimagelodimadakajuxef.pdf
    • https://drjou-vc.com/upload/files/25128746175.pdf
    • http://hasici-pristroje-eshop.cz/files/file/51976221869.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c506bd1c5c8546f8e63179339df67433/25280047851.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d4e5c865e36695c9fcdee6e57c0820c7/80910500825.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m46o7eqtdcmo8s1a8ev7mfp88t/98894250697.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160906e4722c58---fajisizurekakode.pdf
    • https://zd-zeta.com/uploads/files/202108302326257678.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93dff35876---31716951185.pdf
    • http://masan315.net/board/imagefile/file/fojixotetokogexigolo.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a33ae60da523dcba5b1c6bd5e3a07e4c/37299977820.pdf
    • http://zonazero.es/userfiles/file/mivutor.pdf
    • http://szwygs.com/upload/45415602973.pdf
    • http://linhkienhunganh.vn/luutru/files/31533100583.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/72558487070.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7d7ad1ad---33947632859.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3e364bd911b8778b7dcba58501918f20/wufivemavawavisi.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6782b27a4d002a9d675b1b400819fbd2/poforalinovabunawumuxo.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dfeaaab7ff---peroxanofusakesarozonere.pdf
    • https://svetplus.com/userfiles/files/xonedakidevuga.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mcr+24%2F28+mi+plus+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc00.bin
25a160ca72cc869e9e40331a7205fc022f330c8c463047452b837e9e7f8b23e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 10696 bytes
font_01_sfnt_off0000f4a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 16792 bytes
font_02_sfnt_off00010cba.bin
cdfa25c8f925c6a351688b1cf0e4e5f4e3101a21caa582600d5327d2079c82ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 19480 bytes