Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb58d0b4a016fec1…

MALICIOUS

PDF

91.4 KB Created: 2021-08-03 23:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5722b8b8a90652358f9442dde120a92f SHA-1: 148e4846ada85e60574dc091064c86ae9f503f79 SHA-256: bb58d0b4a016fec171a93f5976789ec786fb257e623ae7e71bcbeb117c95654e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS uploads or appear to be part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of urgency lures further supports this. No scripts were extracted, but the PDF structure and external links are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=are+flushed+cheeks+a+sign+of+labor PDF link annotation
    • http://africa-emergence2019.com/userfiles/file/womep.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/pokatitig.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/zinezosivagelofuro.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/gumanufusoku.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/94111557712.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/47337412011.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/42324817911.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/tukufekedojolajesi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2498d48352---jobeletiweripigamiduzip.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/japaw.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608569bf1938a---38231470487.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/rozug.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e67c4010a---rupaworakesonifojanodozij.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5d279f702f8d54e49882772f49f1aa4d/5900468468.pdfIn PDF document text
    • https://melz-feu.ru/upload/31008995545.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gojawiso.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/ripotapikober.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32aaf3bc58---sapiniteduve.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/im9ciu5j05de4ar025ulvsdo07/jazonolaketuwafaf.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/fakiput.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/tatutemijo.pdfIn PDF document text
    • http://coumert.com/images/file/42469984467.pdfIn PDF document text
    • https://atl-50.com/files/file/59225952820.pdfIn PDF document text
    • http://rafaelokazakov.com/file/8700877463.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_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 10968 bytes
SHA-256: c209c170568348f200af3bc33ad396289417ff06b22e22e735f5c13d74990964
font_01_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 16488 bytes
SHA-256: 15fb8e4c4d1c6c358fd16c0f64daefdeca1066b097f220f26207b6199b4a56ee

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