Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a31dad081fb2a7a…

MALICIOUS

PDF

86.3 KB Created: 2021-08-15 19:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85cc3bd3e484b09ea8e813ebe3f0e37d SHA-1: 124827218abd482334b58dc8816ac514da705df4 SHA-256: 2a31dad081fb2a7a4d133c5c287e5380af45e86c1d477899b036e7dab27622b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=spider+man+mod+gta+v PDF link annotation
    • https://limsurempat.com/contents/files/malowuwokenal.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/xajuwinuxovijup.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160dde68857998---sewag.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/df3e53e9f30a0e5aafc9b6bd100283f5/lirevawobegudafe.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/begesora.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/13bb8d872c6174467501ee024ee1bcd3/76263655401.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dj8o9q0nhd7cvclicgie6p8pk5/56657438535.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/46742868216.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/80p5th8nepreo20g4pa6k5svb3/4315957945.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/rofumakeg.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079903f7dbeb---3538742199.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/442pmci3obq3lt5nsb5p8nfujk/betodimetujaviwugu.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/21278505782.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/puzeriwinij.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/kukezovogunuwupi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210628/file/42142064795.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160860b39ebcdb---pojerive.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5119462b9bc6eac7240d020e534e774e/vavekoj.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077b87a5b45c---gojusupotalamovonajin.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be71f493a22---10508942872.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///70389212817.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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 20680 bytes
SHA-256: 24365350c92d633d552fe68f111c9b02d588084984b4710e703bb8abb9450288
font_01_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 10660 bytes
SHA-256: 317c69f436b617d3094894d7f385558363d4b2e5b60e4124f8e23773301c6699

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