Malicious PDF — malware analysis report

Static analysis result for SHA-256 060457bca5f88abc…

MALICIOUS

PDF

86.2 KB Created: 2021-09-23 15:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cca72e9042793eab983ed3043f9e851a SHA-1: 567ed01ade5e9394d62181c90f24c5232299e27d SHA-256: 060457bca5f88abc7bdd92e317f14b91ce01dc2b15f6ed13188e7213c21df6a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://videofilm-tv.ru/content/File/sowufakewanasidof.pdf In PDF document text
    • http://crm333.com/documentos/file/ropipadedezozar.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/tubusuletagokenukotel.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/eko3b3o2pugrfna5tesge5ga31/88375306548.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/65499373991.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/duxezipezodifake.pdfIn PDF document text
    • https://pindimana.in/uploads/file/14853452962.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/5843335075.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/17958779039.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/28604645642.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210911055353.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/likixozopojizupugirumavo.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/gevigifenujot.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/6157008664.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cedc43ae---genukonig.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/14524239968.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/76549084180.pdfIn PDF document text
    • http://koddous.com/userfiles/file/wimumegega.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/zizateramezusopubuwopar.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/41665336633.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/xurivenamumeretumogowed.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a3c433fb1---menuzasanexowabunusunove.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/43427695822.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/38936938723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=droid+star+ham+radioPDF 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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 10232 bytes
SHA-256: 8bf9149c7c83ad35656f461771b07eed092d2a8549ed1407acf13aff79b4745e
font_01_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 18672 bytes
SHA-256: 680cc6262106eb12c3c5d0879848ebc0f31e3a8d631e5d184639886c0bd916aa
font_02_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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