Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b26a4d0322d8555…

MALICIOUS

PDF

71.9 KB Created: 2021-10-05 15:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a0f218082e08fa8fc1ebf27c9814836 SHA-1: 50ea5bda398baa8e28adc537fe45e5446dddc318 SHA-256: 0b26a4d0322d855576543670ec1736d84677c19e5888a2f7372ca7eb4726e810
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 compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://anshan56.cn/userfiles/file/16333071231370773048.pdf In PDF document text
    • http://otczenacts.com/media/files/91692637404.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/sedozofivimixalurura.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7uiqcfmca6rldi7a46r0bbg25/tovulatewusumowozajoniko.pdfIn PDF document text
    • https://educhina.mn/editor/files/5425842838.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd00837f86---xaligulosuvofizux.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/37070350458.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/92140391514.pdfIn PDF document text
    • https://serka.com/serka/upload/files/jevurajumixapi.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/98869044695.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cd5063cab1871f3dc960caf217b33be9/lufazolotoleladutuwop.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/90567539364.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/wujatunobekabus.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/17511373319.pdfIn PDF document text
    • https://desmar.cl/gestion/admin/images/upload/file/lizogarafazomilidisuro.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/refokisugim.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/welemukuvadokol.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/69984357041.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/welaxatisopuf.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ef93k7dd4coiu2qevfrv9dv4g7/88049970531.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/21001944616158d5bbc83f3.pdfIn PDF document text
    • http://gr-chem.com/upload/files/pudadabidefoxibe.pdfIn PDF document text
    • http://centre.annuaire-regional.com/ckfinder/userfiles/files/32150783661.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/xapekikexegoradudiseka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hangover+2+tamil+dubbed+tamilrockersPDF 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_off0000b2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 11220 bytes
SHA-256: 0294baaea0d6827dab706fe8d09b2618fb0774b750137ce6dc844a82ec506aed
font_01_sfnt_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 17600 bytes
SHA-256: f209261d62322b3c5669d0a762d511cdb81f61c6ef35837c9523399b0e2fa710
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1