Malicious PDF — malware analysis report

Static analysis result for SHA-256 016158b48abb12a7…

MALICIOUS

PDF

94.3 KB Created: 2021-07-03 09:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 808c484747d7aebf583b229f9b1112f6 SHA-1: 0642ad43f4957ace32a2a3b4f30b0cd2b7f20d63 SHA-256: 016158b48abb12a7dc7f905d7e99d0fb5012f5e955ae3bab49292b12311254b8
156 Risk Score

Malware Insights

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

The PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • 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.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7e262139---gobuxawedigadokobo.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938226d96bb---88316682289.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ef548e73b02f8fdae9fe320281fafcbb/95432416695.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fezeluk.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160899845b3cd5---36338101437.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/taxamaturevepazud.pdfIn PDF document text
    • http://bjjiffy.com/upload/79180671391.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/5nrh8785up60e4h999hojmg68s/defibugufibe.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf11a64dd16---71652533241.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/49900313967.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gbefjaconcie3iu650bmlqv0s5/3565021424.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/982693702ec02ec2674dbe78e5f090b5/85666707385.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf24b7e31---18917104489.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9f9ca45d7b1465ba179013ee7b20879b/71347727649.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb51bb9be---kopewatotatukogidifuvi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/rekadabosana.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607670ad14ff0---14432495446.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hgrn037h3l86pm8rvf00bm29km/gawidirutegivolediduw.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bcd284fae9a46dba52e5ef7eb0f4730b/tusopudesonusovopawizino.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/munafimepu.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/33510819205.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ao5knilnp2pf15l20c1ptpsgt/14119494055.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b36c2144---jotekixadesijuf.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wakije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=motivational+stages+of+changePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 10576 bytes
SHA-256: 2ac69e3d1ebf23e1606ba31ed102b8136c7c000cff603184032a80a6a6600a57
font_01_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14229 16468 bytes
SHA-256: a412f14f5f0a893740a697df24344aa435bb234dbe583fe27e12b22a917d8ff3

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