Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca72f9bd7dc6e7e…

MALICIOUS

PDF

91.1 KB Created: 2021-08-06 03:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5f67d99153881f749ea8ea74c57595c SHA-1: 326cf36669652667153d7a2ce53ca1f28e4448cf SHA-256: 3ca72f9bd7dc6e7e1229d885eec2f99551f616acbd9ec1925da0bd03e440b559
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://smidgel.ru/uplcv?utm_term=astra+twintop+roof+problems PDF link annotation
    • http://sxhk365.com/uploads/file///17111098170.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/suburanabeg.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/iq7vl0atudtpnh0ev766a6lrhd/32397075036.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/11ceaaa05710ccf277c580a16d6baa43/35355526942.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6f452c7d31767c3b9c525013a589fc05/20942391424.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608834490171b---sujanibutuzexubavobidiru.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ad54970b---feledefoxizawazujur.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/kugerapelekezufikoguf.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/litelufilovijebaxenot.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0bb42823a408db86183555f789f8132b/safipuzuxurixobexopopa.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/29782349316.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/6953573465.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6a30b45e---85772585386.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/ludilubinuzi.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/18363261776.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609237e0b3b08---rodadoziwolonoxakufiluk.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da88b910aa---90815066886.pdfIn PDF document text
    • http://airmon.hu/images/files/37919738443.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/47831692088.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf813db56a3---52690622277.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9017a7940041e0d146557693fa9525f6/beligorone.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c61bbb39fe---77466025799.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/minelitiwejizezini.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zerono.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_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 18548 bytes
SHA-256: 8c5412d355ebd1150f03bd169ae5d054bd8acecf8be6ddfafcef94e58f550dd9
font_01_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 10724 bytes
SHA-256: f879aaf0da24e2c5ff8cd21bea00c8a7ca64ac4c349ccf9aa78c9350398202eb
font_02_sfnt_off00014705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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