Malicious PDF — malware analysis report

Static analysis result for SHA-256 27eea0dbbc783613…

MALICIOUS

PDF

71.4 KB Created: 2021-10-04 07:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca8d13485da67709bc69ef06e4989362 SHA-1: 27bc4d692a8097eaa67f87ff66fdeb7f42d23e7c SHA-256: 27eea0dbbc783613539f53595ce03ad3249361673fef80cd4884ec59108fd9d6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised or disposable domains, indicating a link farm designed to obscure the ultimate destination. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The structure suggests an attempt to lure users to malicious content through a series of redirects.

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 http://etre-belle.su/images/file/temekidasu.pdf In PDF document text
    • http://saxonrt.hu/img/userfiles/files/97953820386.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/8712588078.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/pogurawenawunagura.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/fuwowuvujebaja.pdfIn PDF document text
    • https://limadelimon.com/images/file/jagoj.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6449d753b---16345305359.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/gowixapefuvigu.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/79639109780.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5b2733344f1f10a572c80930677d6af3/58000276609.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/xalodizigubuwa.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/32451920334.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/80979091320.pdfIn PDF document text
    • http://ktcz.eu/files/files/gerubikiviwovemunegulopi.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/80190091732.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/fesofebaxexudusi.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/tatosibenidef.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/51930976453.pdfIn PDF document text
    • http://01host.ru/userfiles/files/76877855450.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55a4096ac---minetedudupafifo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa4105886---30645355907.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/durupigekirepomozitom.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/kumixejezizoterubawubaxip.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/vedusuluwirulumefuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=printable+music+quiz+questions+and+answersPDF 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_off0000b298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 11064 bytes
SHA-256: 2526b8116766e601d890640f9a5d7296c30e3fcd13f0099be7f7bd2e9ecdf076
font_02_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 17316 bytes
SHA-256: b4d5172c30a055b8249ae010cd6bba422cac0e1c706899fd45df7758acad1092