Malicious PDF — malware analysis report

Static analysis result for SHA-256 6447e3292002f13f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 08:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a90b7ea9bf8902bfeaaae33206f3cdc9 SHA-1: 0ae1ca6422916cacae3e04b67df916bb43a88f4d SHA-256: 6447e3292002f13f2177c85edbafdf4cc303f8edf71f48c9e9295000cca9cdbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://apsons.eu/files/file/sefulupajalex.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/k0bk065s63olt3tprsvv2b0qd7/51069646146.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/23219796425.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/ridegigodurukos.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/kosisutifi.pdfIn PDF document text
    • http://nktrading.qa/file/files/zijimetemizar.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160870a71a4310---61364731935.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7411df251138cadfd8167537327759b6/nededumajixefifanubegi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455d71be60---90828743681.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/gumakogemigomewigufineja.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/j92otcm1fg13liv8l0clbfteif/99948459826.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/98a239e87466cd34e558cd6c1cce51d5/xagif.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/16987667889.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddcf2446c3---zigudorikoxokakemubimagel.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda47d3ad42---nawupipuzelagikej.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5b6356b4---fomomizeredivuwudu.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/jalasuwawezurusuve.pdfIn PDF document text
    • http://gistys.com/userfiles/file/zexowu.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/13294262903.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6fd99e26b84bec0e7d1da5cc38c5ea69/32471071861.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/zabav.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/jatebixi.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/zivibumabegisige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=4th+grade+fluency+passages+with+word+countPDF 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_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 18300 bytes
SHA-256: 8b0e8c12232778ceaebb4e5794420ee12bcfffb858ee805768395bdf870743bf
font_02_sfnt_off00012f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 11180 bytes
SHA-256: f9c91ffba2aa0645bc3c1ff596a4d900bc0872b64cd4d23313e99a6693e63b05

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