Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ac9d054f5af4b2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 02:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b55601a1d16c43aee97c0cfb8870cb35 SHA-1: 49efff92f1e41271bb0b9145f8120cbd1120be0f SHA-256: 75ac9d054f5af4b2eb48cf56521abba7dee0c0b35de08a2fea2ce2207c5fa3cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may instruct users to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=como+convertir+un+archivo+jpg+a+pdf+sin+programas PDF link annotation
    • http://aljazeerahdrilling.com/userfiles/files/32058068803.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/87300490473.pdfIn PDF document text
    • http://moretonassets.net/userfiles/85268205402.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/pobiwakaxorizimisipufu.pdfIn PDF document text
    • http://fedime.org/imagenes/47739333246.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5e0a9f7e947363cec8cf74e823d26ddd/pedekovatenaxeregidofipu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8bcdec83651bb1e0ecfd047602c57720/pugakumulemuruni.pdfIn PDF document text
    • http://lagrupacio.cat/file/fadefobejezera.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/dapapofewomopixopor.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/46392115306.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/rozupufu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc757560e---giwozigaxuvageminizigawu.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/65349485486.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/mucdtofskv3shg7thbiru0nicc/67852075165.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/41009559055.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/585affae4020233f7364b6f2bd1dd163/gufinakutomanofibawo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a0d46ad6abf0b07c6f61bdaaea800d44/fozixeso.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a3a2d0cd4ac5a59a3632acda3f8d5809/19110021274.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/3923527630.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/zomanawe.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/49624347012.pdfIn PDF document text
    • https://securitydm.com/slicice/file/91016746837.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ecc4e4ca---2112707108.pdfIn PDF document text
    • http://grimastone.ru/files/giwen.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_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 20156 bytes
SHA-256: ba3b9ed25c0d06ed39670520393f1a3fe48a2bfb36ea60f52a09956d2afd7d49
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 11348 bytes
SHA-256: 2ec14a6497adce664f215308661e1f091688e3975446dd2b70cc734bf4a99944

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