Malicious PDF — malware analysis report

Static analysis result for SHA-256 671abb68162c9393…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 12:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff1fb9dc6dcc50932d5c8568719b3aef SHA-1: 41346874612ab7170a14244b47363333e59ef1ed SHA-256: 671abb68162c93938a6fdfc751ef1536c0f8342c9ff8965ef44189455d1cc58a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and a URL that appears to be a lure for downloading a service manual. The presence of these elements suggests the document is designed to redirect users to malicious content or initiate a download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=kymco+uxv+500+service+manual+free PDF link annotation
    • http://www.ecvbrass.ch/user/web/file/28434759653.pdfIn PDF document text
    • http://simonide.org/userfiles/file/69256399355.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/69484668947.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e121adc439---88833242620.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1b19caa85ad57bcffd805db7956360fa/negamabimarumu.pdfIn PDF document text
    • http://lagrupacio.cat/file/kigamumaziwoxusutikoredak.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/pabowedose.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cksj71pnsovcvi7seqtoom0ls2/21031554567.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/61860382241.pdfIn PDF document text
    • http://domario.ru/userfiles/file/vopadopefawopirezilit.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/saniz.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609785e849892---buvigofezazusujivodux.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/00fb933e4f857291cb3bf29455b33db1/tidakigufedivewawoge.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/47738644532.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tr7p95bv88jv78uag9d0cdveo5/99592841649.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/t87k7idpl6qktb2k9bt3kht37u/gosububufefur.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/42658791761.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8525b3522---38307744374.pdfIn PDF document text
    • https://daismene.it/file/xulowufamo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/wikifatazeri.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/82764893531.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/funepotusebisojisab.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/4910776632.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_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 17632 bytes
SHA-256: f2515d930e8913976b47632210f10278378b7bf5e7128658c96bb5966603ab2b
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 11028 bytes
SHA-256: 1f782508b025ef5dbc9114f9b5840f68e0a49ec563de067e17929585354acf46
font_02_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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