Malicious PDF — malware analysis report

Static analysis result for SHA-256 85abeb7e337e947c…

MALICIOUS

PDF

117.1 KB Created: 2021-06-26 17:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fc38efcd2f19bd937cb93087b499d668 SHA-1: 299f6a116a0159ccd21a313304dc526383418057 SHA-256: 85abeb7e337e947ce43a5b17c5b177263d7cab325533dae4ce9f444822bb9b60
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://daiichitravel.com/uploads/news_file/suwaridovazaforananiwoti.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ad5c7a28e0fa703f488bd439f559a48/soxugelovofizuva.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/niotl48t7i42gqeq93luohe4no/feremasaful.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/417e15a10488d7a2518b2c036472d7f9/debapetuvewo.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/mafaxowikokopipoduse.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/rotik.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/mogitufise.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dd339dee665a43ddc6a5ee1f747b4625/bijosorisasajakibegi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/46399570522.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609df968603c2---mitogumitim.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/72e2065df706e96aff13e3fb356b8bc2/kenuxuvagedasazu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0813aef8cd49931dcc9f329d31c5bc5/34048170771.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/93271004713.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/815976ac03f6588cce69782d141c7b46/31642847832.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100532576708.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c98c06c579883cafab309cd60c28920b/rijejufufod.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529131724.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4aaqu5ehtrmmfbqcvvfshr8jh2/63244599077.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2f7e3ah56bf928u5gkc4f9si87/52374183540.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/40229313645.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb571a281---21867781892.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607459ac92c29---godukolewakeroka.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1onsbqr63an2d0jvkjui3u7b62/wawadisukiburozo.pdfIn PDF document text
    • https://steammining.com/userfiles/file/jikasizuritorajapu.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/sobananimilomixala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=representment+meaning+in+bankingPDF 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_off00016619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16619 10704 bytes
SHA-256: e45a21a476f4828a5e9154eaf3172502faaa5634fac9396809d10b55bf12cffc
font_01_sfnt_off00017e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E71 17784 bytes
SHA-256: e1192bc21cd47937d5029d261bb3c7262f2827ca9126457561448614eae7cd0b
font_02_sfnt_off0001ad4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1