Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc85ccc5f6ca1a7f…

MALICIOUS

PDF

91.2 KB Created: 2021-08-03 04:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 542e46b0a96994bf1c5b170a32984ffd SHA-1: e5ab56f4802091626cd7b9bb0db45beef3ca1b9c SHA-256: dc85ccc5f6ca1a7f923d58e73579b14c1a22415382ed90f1d588e4e4c5c81099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106f8f8d194e---16720041742.pdf In PDF document text
    • http://bhhangkhong.com/upload/images/files/86426073921.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/xojipilafiv.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b8c36b18b3830ade1477fc71762a2c70/53575495776.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/44878334729.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d5383c65ef54ea4453a166340289c2f3/21830565448.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff59495377---12723605557.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/78ecb3725e258fad4f69a1ec2c948132/lokukameragatuwekenam.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd14b0b31da---72570774278.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/3nsjj0sitpspplvbdlrdfpbdai/komeludoxafadagibu.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/42781400935.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092f99f39728---64143796932.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160941790184f4---50791219362.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210511082745259013bfm29l.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vhen6u6p8eg5c5upn48fgd6vi4/fidetosogopo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bb7604ae076bd292b4a79e99797fe721/35245202336.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fe0a89b405262c59cb7ef73a438f6d35/sikidiwanupot.pdfIn PDF document text
    • https://fasaac.org/temp//files/wusoduvufexoditerugirasap.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/xovisojo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/gisalus.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4fcc4ad3c16d4bfc632fc5c42cedf0e9/junojekexixobetikalezi.pdfIn PDF document text
    • http://hncastlecable.com/d/files/genemudolevaxuza.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/49048408195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tom+and+jerry+movie+2021+trailer+songPDF 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_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 11156 bytes
SHA-256: 62da5636d21ed5566700db43b89487335ce5d95202723b75deab5bc6b013adc3
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 19720 bytes
SHA-256: 270191b598058c7d19f67c5b0cd8fe2627881aabe95d8b2d8d71a933eaff1e40
font_02_sfnt_off00014599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1