Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71ad4cbf5dc1e01…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 20:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fc31ff54dc0eee2e21b6d34eade4e5c7 SHA-1: 628c7cbe424c54082a869e388471c4c3dd497eec SHA-256: a71ad4cbf5dc1e01691f808b9976e29f4feccb66a9e731817792fa1955893a7a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The embedded document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=bmw+m5+f10+manual+for+sale PDF link annotation
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/cbc7d1992f01990b545cbad3250ecc26/mekegol.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5bbab00d0---85387175773.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/15082949989.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2ab92e25f80f9267e0352db028dd79a2/30518783926.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/4563d539a0d0a1bf2a72240f008a8012/49505906649.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/domajegizetorifaxufose.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798b2cad41b---23531924043.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/54022748588.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zaragetumizuragixarod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608add276c2c6---2507902471.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fe0212557---86567263843.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/122234035ec9eb2d4696b5d7e096b8ea/15421702134.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/81980062645.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/riwejobigowokuvurifawem.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3007f3e801---29848310151.pdfIn PDF document text
    • http://aimic.com/userfiles/file/21091809832.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cfbc609849a5832cc09607e09f7bc7dc/sipopenevodivutipazaw.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/cnh0qvkvvtrd4dhevajmfs33m6/rufusaxaletexuva.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a9793bff04797ce4e9f7a6b21c45f241/raxofutemakokupixokop.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088582c6eff6---zafogoromemomidazofa.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/9439028056.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160761a0f2383d---sifipexuturosasosasogifal.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5bd1aebab---mavokine.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/30467579852.pdfIn PDF document text
    • http://pneusmarene.it/images/file/33304842340.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_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 10732 bytes
SHA-256: 3675a02a225f3673f440836bb8d45c9cd0fd265fcdc79e5165f1da3211e6f8ee
font_02_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 18032 bytes
SHA-256: 6f8cc88f833bef7698457f90b5659b3574cd2a4b4410588e3c27089c999d3649