Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b33e5dabc51cfce…

MALICIOUS

PDF

93.6 KB Created: 2021-09-05 11:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2689b7ebfb94a644d62de2128b4365e SHA-1: 2bdb6c9d33373b1b3fe9d970c818f725c7640ae7 SHA-256: 1b33e5dabc51cfce8c81defff289727253deed5c91534c6afe0079a6f25edb39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable domains, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=grammar+based+models+in+computer+graphics+pdf PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16104849273f78---sowitabodutodik.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/nadubega.pdfIn PDF document text
    • http://popmetre.com/news/files/87876773656.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zadedazaz.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/b49ad6914dc3a671ac21766b4d7af0c9/siduwuxebozomidefefa.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jqmj077tg72hreim5itfe0v2m5/xogubiputexokuv.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/lozezutivaxirupawupadej.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e590efbb3---gakeginosuvufawosatuli.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/97976939681.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0b20368306a19dce45ecd7abef5c2794/31966185886.pdfIn PDF document text
    • https://davaocarrental.com/images/file/90566578434.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/46aa83b2c122b76530ff9927ba2fecb9/tedegodivebamuxu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a7e9b47fec747c41ea1418fd62ec97f7/2828832100.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/69053363083.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/murogonofaki.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8ddc914a---mobof.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077df64643ee---mepemadas.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/66364523704.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/af102ad82a7e64517c1efe8879b3ffd0/98088843293.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/703633baf689d7aa986d56d99c970213/86482374158.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/37643756921.pdfIn PDF document text
    • http://ipceurope.com/assets/file/86136666491.pdfIn PDF document text
    • https://jetaime-shop.com/files/vasikasujezirofu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c8142f135434b97a06d9f735967b01f5/87199951630.pdfIn PDF document text
    • 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_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 18476 bytes
SHA-256: 1c9f9988baebc17beb95ed7d3284d081746f94190841f5e162c05e756cd66b8e
font_01_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 11344 bytes
SHA-256: aced3f840907c55c72a6b55cfd875ac71c509db55706fb88b5b9a703ace4aef9
font_02_sfnt_off00015019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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