Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7f70d689304b0b…

MALICIOUS

PDF

102.7 KB Created: 2021-09-01 06:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecd76400a0d5382490865e1121c31f48 SHA-1: 32f15139dd01781807dcf2235edc022f1b48dee6 SHA-256: 7e7f70d689304b0b5899e1822d660ca7c016bf99148181ca4e6e0bcde62b93d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that leverages a link farm hosted on compromised WordPress sites to redirect users to potentially malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nomylo.ru/uplcv?utm_term=philips+hts6600+manual PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d57ca554c40---2161040472.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/4678308048.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/69667091104.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/zozimuwato.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/49468740905.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf9647757---22984573595.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a515ad5e9---57405204473.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b30a9cd58c---godojivorupavonawobesuv.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210705171614.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45845778d8---talamoz.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/nagowojokabevupibaj.pdfIn PDF document text
    • http://e-district.org/userfiles/file/3776982087.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3b88ed30a---zuvuguwowatizureni.pdfIn PDF document text
    • http://szhlfz.net/upload/razudipiligexakit.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/punikopanabi.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/67310536103.pdfIn PDF document text
    • http://web5gstore.com/Files/files/nijugabefikazaresanokilo.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/jotiwawilimilefes.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c66c624626811ca8959f27f65afb262b/94854068272.pdfIn PDF document text
    • http://myredm.ru/uploads/file/10027782379.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/tesefuwivepexovijaw.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/47792169809.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/74529383189.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/rvf80mmn1i3gno0edmp2h838b1/wirifega.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/muvuzigegunilerovu.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_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 10556 bytes
SHA-256: a0b36cf032479c7306644b2fc587d51d32d8a37007d08556fcb0cb5411072208
font_01_sfnt_off00013e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15621 20796 bytes
SHA-256: 72ad7b7612c411b470bcfa34e6866a547ad0a17056eb735fc91d04a6b5f8a4aa

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