Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9ee6c58a0b29e6…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 06:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 631178b1122a9eea3c64640e662db6b0 SHA-1: c520acaabf077b5a6f8f5d1af3d542ba75f33d86 SHA-256: 0a9ee6c58a0b29e6e7715f2cc65d4973b1b66de40f33bdbab183bfc7a4c05ab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly supports the attack pattern of luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://transbur.ru/admin/ckfinder/userfiles/files/15623482730.pdf
    • http://hoigolfbinhthuan.com/users/files/41064568432.pdf
    • https://swift-tw.com/lcc/upload/files/kunudawiv.pdf
    • http://fabtur.ru/upload/files/24054348384.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/vanifonojokapepabelap.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/e30ec5e8133def721deb5432c22e0854/nejijuxabok.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/63376469755.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/t58984sgcb1g5pec13rgj7o871/67451710182.pdf
    • https://oklogistic.lv/upload/file/suxiteninimodutugilemize.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sahca859oddfngc4f5ll5qig2i/dukevenezoluwiguwuf.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/738d757460eeb7f3891855990ae8a736/xotegoxiresejuledopuxina.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7e7aa5f269ea06a063ece514b02e11a3/77074341936.pdf
    • http://bukharageorgia.com/sites/default/files/file/44129787154.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b630cae919d---37867810109.pdf
    • http://alarcon-v.com/editor_upload_image/file/donisurisew.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6bb8d63fc809eca6058da1b54d3a339d/dudip.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/17945928461.pdf
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/tupuvilezuroxalejiwox.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebece1209---1946963903.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/125748dc037b3d48bc160e4e49817634/55261222643.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/xoguva.pdf
    • http://sportsgarten.com/editorData/file/51850330231.pdf
    • http://rymwid-training.com/userfiles/file/53350775775.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/205671630.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210515231019.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=biological+classification+class+11+question+answer
    • 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_off0000f69f.bin
13c0eede621e65b814004d80f8f2011a1a5cb832dffc6d4d54c7c65f2a10d5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 10948 bytes
font_01_sfnt_off00011001.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 16792 bytes
font_02_sfnt_off00012813.bin
44d151252d560b8963448029e3da6d49d946bb7f717a91a6427a41f4c3e84913
pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 16640 bytes