Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97d6faef4b8a4e7…

MALICIOUS

PDF

79.6 KB Created: 2021-08-31 00:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 182f78474c595953c53f780205460d4e SHA-1: a95232993107c50d34ff0eb7c72e59dc3352f8a7 SHA-256: a97d6faef4b8a4e7dd146c59c88edfc34771b22217f14557941a9b2007d4e9e7
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 0.9917

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 https://medvor.ru/uplcv?utm_term=payshield+9000+host+command+reference+manual PDF link annotation
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a800481cf---solokezejuduruged.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/90252335177.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/dinutereberag.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b3d436c64727c9bb1167459f6b4b1701/nogawupovewikigumezamuvon.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b924b969c---63762441533.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf57ea7afa---62467663206.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/55037015881.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/68657888787.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffbf791acb---12329383347.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/89264450390.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/14/71375647922.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/jetavexuvofuzodafofase.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/nafowuberekemazaxapugoxaz.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zipijuvebegadi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/o3r63l39mmjs19u757kgucmn0k/lifopik.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5aa61e751---gixaforowovojugukozodi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a76a7571b---rafawabano.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/11675083340.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sekopajukovaf.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9c7e07915147cfe871cc02f4f9779ad9/30671677457.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/zuvukuw.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/83722866245.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/wopij.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0f194b44f46adad4e5ac8b34895cb214/vifomazimulun.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/tozimefusemerivobera.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2gv8qs7efkdo85vq5b79vvbkj4/wipajaxovuk.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_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 11244 bytes
SHA-256: 38e99d582f9cb7e2a06f31e8beede88b8c456b5b38b838f1b4f56dc24d760782
font_01_sfnt_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 19472 bytes
SHA-256: 4f8682551e247ca33a6a3a545fc11d34b6d94ce3466490f230118cd6fdec4cbd
font_02_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1