Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1672071655d60e…

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 22:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92333121578cce8e887261b72f64fceb SHA-1: eb5c37cb4645a8c4566007587608ce4d36065496 SHA-256: ab1672071655d60e8db7da0af09f90a11f7ff2a20a4499739849aeb135916a04
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous links on potentially compromised or disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://binarbaidequipment.com/public_html/userfiles/file/94713413008.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b840a1af7f3---voluruvijajajugapopupelaw.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b678ac0eba6---fodabegubegam.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077b85ad404b---43743139164.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/82c706a4fb8299034d57e8bd8ee9a32d/7670048036.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160913481910c7---wasot.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a510d10db5d857a48f267bcda2acd317/4916539696.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/57483625975.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/66cdd1da45093ff9f727185b39e4b13b/tonejebifa.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/775fc27ba652f92a92d3afc7754892da/mojuti.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ff08e2e482f928550fb9e94184128344/3165443305.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f60f05482---14954609068.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7fd8fca57ae1e62465479664099384a5/62460456153.pdf
    • http://penzionklara.cz/userfiles/file/wulebuvavilamusi.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084301dc4ec5---96074992527.pdf
    • https://ratsimae.eemedia/contents/file/6683745696.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074051e4d815---jikejaxadimedawajigekuba.pdf
    • http://ttccid.com/userfiles/file/zonubatupudazud.pdf
    • http://akicgiyim.com/userfiles/file/85920226790.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e2c6e251e6c567a18d281755252d74d7/xuvumagaredevo.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd56a5a2acc---pazonufofupatori.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b687d81cc180e071474177567977623b/sadosezeditasuzapoxejib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=percy+jackson+high+school+hoodie+fanfiction
    • 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_off0000f83a.bin
ca6a8ed41514ac547d9bf1879f9e63f0c5dc7eca70b69d9f57a8d97f73b06278
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 11092 bytes
font_01_sfnt_off000111ce.bin
bd81a522880f2bc6e840e8fc85e5b35bc80d4dc972985adf06246019532850a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 16380 bytes
font_02_sfnt_off00013c60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 16792 bytes