Malicious PDF — malware analysis report

Static analysis result for SHA-256 c515cb3e36e88cff…

MALICIOUS

PDF

86.7 KB Created: 2021-08-20 12:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d620a0f4122b20072754c82abbbd65d9 SHA-1: 4299f40805f9e0fad11171a232b646c162dca898 SHA-256: c515cb3e36e88cfface5305ace2c43ae9fe2be51f2b781e5d6ed92615571fdb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to lure users into downloading content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=fast+and+furious+8+full+movie+download+in+hindi+dubbed+480p PDF link annotation
    • https://ilcaminodaugo.it/file/94815676117.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610245e7c0e32---kivowu.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b2d2a5f07---9802791266.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/43620790079.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780cd0a3b86---38023111623.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/soriwidigup.pdfIn PDF document text
    • http://ombs.ru/uploads/files/xujap.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/wafojaxagu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c622ca1a---18342480556.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/52835347317.pdfIn PDF document text
    • http://mp-journal.com/media/file/3730899051.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbff6b183---60642980219.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1830addd---69869860466.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/gexuviziselepe.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/sekevugibevesubug.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/jonirifofujezaw.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094442ce639e---91090726125.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/duxivodojavavino.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc43199a8---latakinerateleros.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j5igcc67robige7cjt3ju9ejq7/59707209585.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/58322787697.pdfIn PDF document text
    • https://banghenails.com/upload/file/banipitim.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/25487750671.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_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 11540 bytes
SHA-256: 5bad49dfa64438b21cd34e4f19d362628ad7581357e99e3213373bcfb58ab2af
font_01_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 16880 bytes
SHA-256: 7523876776d5b3c6b51a24df1f777ac96ec317d551529e3edf60a38f4ce64f64
font_02_sfnt_off00013365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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