Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e09aa72115bea2a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 03:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 434eca6642d221dbe71c3bbb65a05c14 SHA-1: e29cd8b4f12edeedb536a815aaeb92088fcc7e31 SHA-256: 7e09aa72115bea2abaf99ba05652c828e66173a899e99613770260405827deee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for malicious redirection. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or further malware delivery. No scripts were extracted, but the PDF structure and URL heuristics strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8496

Heuristics 5

  • 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
  • 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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc019c0d64---birozegoxukete.pdf In PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/5038491213.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/funubipujugojunas.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/30758039457.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/paboj.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/kukufotijedawelelapuvazub.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf36aa35db---zupofiduz.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/tikupatikimezaboziwa.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/78841336744.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/dilif.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/dedupafiw.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6694bf89d0c7955f37819edc428ef201/58591820567.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/nafirob.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/97282597200.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/sufex.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/30640974157.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/zenelatekidiweritof.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/3949796820.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/tibotetilukamamu.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/52554946146.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bb5f270741b4d8c1e5bcf1414b208819/lorobejud.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/83922436081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=asian+drama+tv+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 21996 bytes
SHA-256: 488a50c52f37948ab615ff28ce2178f4cf89ef69c81f9980f53dae0ab8869882

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