Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a46feebf95359a…

MALICIOUS

PDF

79.2 KB Created: 2021-06-26 11:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ca7037b10d2b2183712c925a7bd4359 SHA-1: f5e7dc24f7c716d2f231d4077d288aedcff07ec8 SHA-256: d5a46feebf95359abd6578f6c8607f77feefbf546c62d971202327fa0ebf3184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=golden+isles+well+drilling
    • https://vandolderskb.com/images/usr/33474719534.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/p19ofpcna7rf6vnpb2fb2l91kq/94973602882.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/61e1f6eaa7193c96f6f38fa76082d67b/wezip.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bbqcp9bp9sp9slvru7namn9941/14562016437.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0ee51c07---59447872163.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/fc54c1f7cd8390b7e1921b85fbe8ca5d/43631351773.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c628e1a0f0---56868652307.pdf
    • http://wtmongolia.com/materials/file/vesorutijuvez.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607706bd9416c---96484615556.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb346c5302---12854546192.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c484138d0c15b7243096d84b6d978e9f/98892639343.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/mnp7s6dspk794onc5979iusent/17475179735.pdf
    • https://toocapen.com/files/sepemusuzi.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/196vp82sgeft54qiahjadpo5r6/25088001572.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077765ce2177---15837167375.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5770f382c5---begiti.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/91e49d20dc19d1cd006ca535fc75523c/lipiberobegavinulur.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4b9dbe70d76f65a8eae76a7a39ba9029/10704349698.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/99118485573.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4709bc26e9ac2ee1ee722037b097f2dd/lukixemikakazodabepewe.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f98427c9d9---50958371832.pdf
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/44430663253.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60790f65a---3262110627.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723efba20fe---vagub.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d6b09f8f---74710537789.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34b.bin
1202099c32905eb2c89a7660e07d1c5d0d60fc46f528c6303c0f275fd8200ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 17408 bytes
font_01_sfnt_off0001005b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 16792 bytes
font_02_sfnt_off00011872.bin
3b7cedbab594bb39fc4b9872f7577e1f5a5deff00e3191fdd10365718e40eaa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 10288 bytes