Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb73036bbd15bb9a…

MALICIOUS

PDF

82.8 KB Created: 2021-10-10 14:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: be96512d0048bbabdca95ff575663fc8 SHA-1: 8314973dd8e9b2e9b75c9a7f8ecc7e38508085fe SHA-256: fb73036bbd15bb9a2187aeeec2871f689fffa4b12b65eb35557e33c422423b50
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xaverelelopolus.pdf In PDF document text
    • https://iamtimeshare.com/userfiles/file/zugobadatisagujorutato.pdfIn PDF document text
    • http://woykoff.hu/upload/file/xolaz.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/jefosutumofaluriropek.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b80ad0b9d---tabopi.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/vojukiraduvemi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1029985b9d070d4febe24e6c34da76dc/22503494450.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/geroxevetolomiwej.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/95866904701.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/jenulenolomu.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/wemananetisazobinog.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/xumovogosag.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/88011677616.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/punamofujovirevotukuxig.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/rodesirese.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/56320537323.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/vuwegupuridemuto.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20211010130802_wgnt36.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/57889992205.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/wanogike.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/91597386124.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/68807872700.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/84143130137.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/fc631e10fae7152d2bb6906ae2292f2d/boxunuwesonikegu.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/kavupajupagowex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=high+strung+full+movie+freePDF 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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 19316 bytes
SHA-256: a906c7ed28e74ecebde0f31050a798bd9f99e2c09bf6d9e35de4b3ef1a2e92c2
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256E 10656 bytes
SHA-256: 5f1ded9a765bbf5a7c03402615f10054e99835afd85612bda951d1c811427edd