Malicious PDF — malware analysis report

Static analysis result for SHA-256 484b910cc85ef6c8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 00:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 463394342f42aa7e2906895aecf004b8 SHA-1: 65fa9f9626607876e0d20ca98d02fea2355df843 SHA-256: 484b910cc85ef6c8f223fdc43fbc457436b033258ce7fd4a251a1fc7c6a5783d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many hosted on compromised CMS uploads, suggesting a link farm or redirection strategy. The presence of heuristics like 'SE_PASSWORD_ARCHIVE_LURE' and 'SE_QR_LURE' indicates the document's intent to trick users into downloading or accessing further malicious content, likely by providing passwords or QR codes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=s7+android+auto PDF link annotation
    • http://konditsionery-reutov.ru/upload_picture/file/desakegiwirevekorasem.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/tajejebulolibozesuvuvim.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4jde2tpapd9np2k0kbjhmn425e/11857218788.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/sapetuteziwafun.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/48156981631.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/vibebifuruvaguwadawa.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/48125706068.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109060850386525.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/bopomopetetizinunimomujik.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/434b7350aa6a3ba14ddcc3e1332acb54/42408868670.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/55581354702.pdfIn PDF document text
    • http://nenorm.com/files/files/davokuvasadeta.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/52506461841.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/kenufazakimagujawubo.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/fodajenujegurowularef.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c118e369a454d1df0d0d30f0038acb6f/nokuda.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/37338302878.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zipuwobubuluj.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/62045769290.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/79215864199.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/vitokej.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/napulusuxumubotumaj.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/6473251877.pdfIn PDF document text
    • https://hssanesteban.cl/files/zinar.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_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 10120 bytes
SHA-256: 08bbaa12b65cfdbf5097718df97e400f9f2e5efeb193147b3bd27f7e16732b91
font_01_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 18364 bytes
SHA-256: 5cfc7a2d858fc344ffed29fa905c0244e7f15b7e008a761726dc76edfb7c7472

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