Malicious PDF — malware analysis report

Static analysis result for SHA-256 319befa023c593ea…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 09:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a18d598539249cd0eb6658f97e9ecd3 SHA-1: 4973511b273723a00ea242a6925b739858c8988e SHA-256: 319befa023c593ea61297630f070002692fa316ee4c2fbea186c190d2dd7ecc1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to compromised websites, specifically targeting WordPress upload directories, suggesting a link farm designed to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the PDF structure and link farm suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2c84be103---weforiwokomudutagila.pdf In PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/18271957017.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1622884040.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/5832277631.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/42737512909.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ade18d56f92ftks6fph9fmolfj/77574195834.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/69115929694.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161119fb1b4f5c---xumorifat.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/supiroriwidugupazinoveb.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b66cae103b4e82a623ad0ac57f4737da/17804821555.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a0716843311ba71b06ee6c47df338b1c/voxabevivizagediwunozuzu.pdfIn PDF document text
    • http://apsons.eu/files/file/datijodemumukujawub.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fimoxevolibupefagisuw.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/4101340739.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/gopoboforavabojuzudolamul.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf45aaf92c---28073808805.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607899141fa62---xaterubunukul.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8f417ddff4e90e19f88920d44d73d07b/xufixon.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/81351091189.pdfIn PDF document text
    • http://suecoop.com/UserFiles/file/forasezuxosakifodowoxuk.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/2958cdci14phj897catr5olnq9/32345481156.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/50064125625.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f67a694afbd3ecc47e31b4c843ddefe0/sotanuwebolozu.pdfIn PDF document text
    • https://derfo.info/resimler/files/66361510738.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021073002193273499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=clearsounds+a700+manualPDF link annotation
    • 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_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 10520 bytes
SHA-256: a51b1728cde28f54d05de7a459472a43e7dfe427ca720f0887c5775f04800429
font_01_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 18492 bytes
SHA-256: 654ab8b9661565597f3d71652a09d33b0eb822bebfa74574b9abead2afbf87b8
font_02_sfnt_off000136d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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