Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0427ca2f14b360b…

MALICIOUS

PDF

95.1 KB Created: 2021-06-11 18:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e226ae142900089cdf906c0be9948160 SHA-1: e3397eee4d2565845abc790d45a14ba39f74ff86 SHA-256: f0427ca2f14b360b7b4642618db23f0cb994759860cf918fb6b45cf26fc86047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to a 'Titan quest conqueror guide', which is likely a pretext to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/uplcv?utm_term=titan+quest+conqueror+guide PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f2a6e0cf43fcd30208e20e91d512d8cd/67101763150.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/wanibarukavajo.pdfIn PDF document text
    • https://ahha.az/userfiles/file/74941733465.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d07cb0610---kexapukawufaxa.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c744ea34d1278bb5a4ee7122b2efec8b/xegulozigowe.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073706aef305---zuxofa.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/zojusawatuvitugiwanuxomom.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/famvf1skjs5pl9ou0516bv1ejf/wokidujowowubinupanufobe.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5332dcd498124cd951ae1b5d39e78551/kumowisuripivipalusewabe.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/turmtsf1qr71fn2u12b9iqlnr2/dajitoxubanomupunudef.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/6c4cdcb3453f39d9305c7962df8966c7/norawufo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4c68029a---lijiwakegojagexitilovigex.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609142963ce38---67095913249.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4b8bee6716d5ec60638187661fe45546/34883727503.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2e673103ba12eb5185e6c74e4df86075/43608716060.pdfIn PDF document text
    • https://eternalbliss.net/file/15089705987.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1efc5t6rek1v50mecm3e1qf4gn/32502112216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 5148 bytes
SHA-256: 83ae80737fa7f28f8be5bab252cfea77b5a165e10ea6ef438c9872c10cda6095
font_01_sfnt_off00012c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C71 15244 bytes
SHA-256: 9a64c0c74aa6eb603fcae2ea9768cc14d3342afb9117b6929eac6e1e53769a6b
font_02_sfnt_off00015898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15898 16196 bytes
SHA-256: 13873d145b8da2256cc9aff7ec32aedf7dd7de0e65fabb376e0f91dd1eea3996

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