Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6179b7a7652780…

MALICIOUS

PDF

84.0 KB Created: 2021-06-29 19:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5033c3ad81682d35262797ba417750a SHA-1: 0f816cb2cc24848f8696443e15e51cd486ddb0cd SHA-256: 5b6179b7a765278028ab57ae5130e48791a19ad97175eb4e1af6f4ea6bed6def
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://anthonygillant.com/userfiles/file/90038914915.pdf
    • https://copab.tn/216mag.svn/uploads/files/dubitebuxelazukujanogika.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe6b67110---95720230042.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/sennntdsc31ojnlq1l4v2ohg8f/jufanivotivutelupov.pdf
    • http://jedwines.com/cmsCart//upload/file/55189644851.pdf
    • http://daisytalavera.com/userfiles/files/zarenunedakod.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a84c31606350753448d56cefe1908396/80855787197.pdf
    • http://imaginove.eu/data/Files/kidixesotimunujej.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160761f0a8953e---99387843130.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/32uh4aip64bkepvltvj8vu9p9p/31760104928.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bc724188cfbe00147a522df36bc831a9/kavasuxazuxolenapit.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160789264a9716---detewuraw.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085628217f11---bifufofuber.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e2cfa8b9296e78c2ae6a4da31a28ad1d/giruve.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/50404181696.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0748eb4ab80e0ec3e1fb27667ea22ec0/ridibanuriradujobojar.pdf
    • http://jjmcp.jp/userfiles/Image/file/39291116182.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/v07snk3vrlil483s7tasrrt651/14737295414.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4eb8a543feeb4d6499c0977e275108c1/xitolepuvaza.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57220ad2b---nipezasozimidutazujes.pdf
    • http://gibisch.org/files/files/pelufazasojarojesod.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb7a64d4e---xibikafufebizasolowilak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=peria+chronicles+release+date
    • 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_off0000e530.bin
c080486649fbd50b7e10ab08f2270108036a99667f90e55e42a80f19cdba6d18
pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 10468 bytes
font_01_sfnt_off0000fcdf.bin
394dbb69c4d5ba3fe6993858da424df972e59ee6c56efe7355c36f0244acb311
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 18168 bytes
font_02_sfnt_off00012b0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 16792 bytes