Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d59cef84fa56bd0…

MALICIOUS

PDF

89.3 KB Created: 2021-06-26 18:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c34304290ec985bb45c32e573dbc648b SHA-1: e2cd832554fd67cc511e57e1537931f9d45559b2 SHA-256: 8d59cef84fa56bd05d0ef40816aa52e4da5836cc931a7fc3f9556248736d3e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, presenting numerous URLs that point to external websites. Several of these URLs are hosted on compromised WordPress installations or disposable domains, suggesting an intent to distribute phishing content or malware. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for obfuscating malicious links or initiating further malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=how+to+get+into+tv+writing PDF link annotation
    • https://rcot.org/userfiles/file/sanefemoniruxi.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ec89273b56836669e06a08aff156a75d/47503420396.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/92ca146586aed160fd477f13a0fee85c/61780129505.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087827ade25e---jaxuzajubidokazogit.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9ad3eb436201ca90460880d194ef3dd8/bijevilinabonerutezexerut.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/72325527458.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/komezonatek.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/edd939523e0d9ddff4e2478fbde8f3b7/gavibulusurekodun.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/36670654088.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/m91fhq6m112i4eut5hokg80aio/86725323801.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/7221456943.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2d141629---vezunazol.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ce53c478448c3a970082c328a822fc08/64466616948.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abf69bd5d3f---tunodeveken.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160801273eae52---tanujotejowipu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c523d6076d3---vatamulorajovukuvadiga.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wotijut.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3n6lsv5tq20j2r9674ms3n6gtj/rixajagolomewutajuv.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/dawuwon.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/fb7f9459235e2632efc0b2707227cee1/junajikibowijiz.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/919ce6487162f90984aee880c089cffc/tesinapemoze.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b208c1ed---bazivogev.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/45722516723.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_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 17572 bytes
SHA-256: 327da7315b27931c704f228b2934053da120dd27ff25c0639dfc9cd81781e626
font_02_sfnt_off000141ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AC 10052 bytes
SHA-256: eb178d42c6180e55aefca735130db52b0867196681492d7d0ec55551fbd252bc

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