Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4a0c328d073863…

MALICIOUS

PDF

62.5 KB Created: 2021-09-12 04:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 711fcb18f0f55fe009eb029adda0dd01 SHA-1: f2f3890b1281d8a082eb281cdb756f6ed5faaded SHA-256: 0a4a0c328d073863c14803e0d3ccbda02805f86ce3c74269f3edfb0fa463b8ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure, likely aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9122

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://philabc.ru/uplcv?utm_term=messenger+draining+battery+iphone PDF link annotation
    • http://restavratorstvo.com/ckfinder/userfiles/files/92964360966.pdfIn PDF document text
    • http://otczenacts.com/media/files/vowabofuloboge.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136b35b32738---nonizupufumepenasare.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/86752623240.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/19431431065.pdfIn PDF document text
    • http://princeverma.in/uploads/files/jawubugudipisatavokufewe.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/11091969177.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/49896643563.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/91246982642.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/jujivetekikixirej.pdfIn PDF document text
    • http://teknis.it/userfiles/files/fiwovobike.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109070932399109.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/nenirej.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/zolasiwuponufenibanu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136dc21b3a54---21434283110.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/xubowosakufujeg.pdfIn PDF document text
    • https://keongracun.org/contents/files/69557771203.pdfIn PDF document text
    • http://msiutilities.biz/documents/lufewuvokamagodi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2459f236a1f7411c2eaff36313f7e87a/xeganatajetorivir.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/vuxojudusivukelilawizob.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/29855563339.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/panadalusiluw.pdfIn PDF document text
    • https://festacontinua.it/public/file/suzobamizutudevofit.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/ruteg.pdfIn PDF document text
    • 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
stream_003_off0000f103.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF103 3227 bytes
SHA-256: 747c710917173bd74f8d8e995ed1be14ad5053c4d6d5e7de24e8f76c0e610471
font_00_sfnt_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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