Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbd75cce8f34de9…

MALICIOUS

PDF

87.9 KB Created: 2021-08-03 03:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 533ff0ca3690d19189a100d77f264cb1 SHA-1: b3c458e1ec7b0edcae6ce502256ff93a836c10fb SHA-256: 8bbd75cce8f34de91ab9c6cc2ffc7a0b617245ee4514f8c9d044f3af7fd58c36
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=ten+thousand+miles+away+sheet+music PDF link annotation
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5b6a33d3---18207535073.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/bsna8p9b9i5hhsbc2m98gkltjl/takuxomoziwelusugedikor.pdfIn PDF document text
    • https://isleo.com/i_photos/file/55920530975.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/dolekatudufelijogomukevap.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a8f0269917eec8b918a3fd92914b0264/suximal.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/giwodokefilekovalidutirub.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160792ac2b379d---86668604838.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8587e00b08---23752928025.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/30467208317.pdfIn PDF document text
    • https://limmaginebistrot.com/file/zoduzo.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/pazope.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607792f3cb241---tiwaveg.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffd815fe1a---bivudiv.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/28603027728.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/nusefuligij.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/legojasujolipo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106424f0dc16---29655067645.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/fivekewarofexoxizof.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/doxemakafor.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/51ecb524755b7963fb4168023a3ecd44/wimidixatofilegetitupip.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a42e5ed3c159da19cc3c278db2e8fa89/93923188934.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b363744037---93370438201.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/24580800283.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4f07f408---mibifir.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/96208946974.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/61166497680.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec5cbaaea---82818039075.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_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 17732 bytes
SHA-256: e290e7ef78ed8e713559450e76d0e4935f65901b89c6fc5642cb1066dcf5671b
font_01_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 10800 bytes
SHA-256: 274bddf6617daec7f7fb9ef1ab2422e05b5c3f5bab04e01ea25525879ef93105
font_02_sfnt_off00013973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1