Malicious PDF — malware analysis report

Static analysis result for SHA-256 360d20102171699c…

MALICIOUS

PDF

83.6 KB Created: 2021-07-03 01:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f8d71f150fc510f822f8dd3b682c04f3 SHA-1: 000729d4f8062cc1ef090bd097ad3b9fb8b8836b SHA-256: 360d20102171699c4e62f8b7bffe034a76c072e3f08ca847ae0d6cb84c83a693
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a password-protected archive lure. It contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting PDF files. The presence of these links suggests an attempt to redirect users to malicious content or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=how+secure+is+pdf+password+protection PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacec6f2ca---pajat.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9fe7cbe6---5227748741.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/23938673389.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ddac6c59---nokumunudedelasipi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7f71eda2---donuwolapilipipumeraza.pdfIn PDF document text
    • http://ashioke.com/images/library/File/koninisiwituxexazipijegap.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/65017283751.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8fa52a91---debefonaseresulufewaxakev.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/719e9fd450c54628c88ec984b3146a7f/10516755359.pdfIn PDF document text
    • http://fructusartis.com/i/File/tekajunabaxifejivadiwusix.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/t3ogh59rfsup2i3sfuo0kqu707/13125973151.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/17698fe96f626d335bb386581e7d5d24/72033863260.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5880cfb5---62030068415.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c55799086f261d86018699d05d77e45e/tuvebuledegu.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/wepatilovoxe.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/fasememog.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_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 17912 bytes
SHA-256: 291da2547e363edb28add24b31f265cf924d184b9a2f227edc4c8965aa3b9322
font_02_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 10744 bytes
SHA-256: a3717d7ca79b604c13b9df93e8d1664f8ddb2a3aeed92fb19a2a9f28b205c4f1

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