Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b31c7a5c54ca41…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 14:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f089a71da23a264f5a951666ed1cc0a SHA-1: 505b80a4c3cde069173d312e3edb6828dbb03a98 SHA-256: a3b31c7a5c54ca4149683d9b69daf80947da1737ef3a1d7a63a5a839a48af365
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites, which in turn host other PDF files. The primary purpose appears to be redirecting users through a link farm to potentially malicious content, leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/qr0b7qvg169nssencketi83410/62226038521.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/475rj28e5f1gup0dool10i10g8/doguzunadotewapamurazagod.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p72bv732n26juehngerclg5d1k/tugakatogi.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f770a991f---37883269460.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2099bfc0c7d309c04c0fb85529109f71/82180624854.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f36211e2086717264448f50bca067ae/ludizavi.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/082ced4252a1b0109295c87283b617f2/81083172975.pdf
    • http://abogarestudio.com/userfiles/file/12532563939.pdf
    • http://smartarts.bg/userfiles/file/zunabeledemoxogekulage.pdf
    • http://ndt-tl.ru/upload/file/96448066040.pdf
    • https://artenika.pl/fck/file/14104479008.pdf
    • https://italvaping.com/file/betiru.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/dajek.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475b581ebf---kigidizipojakozozup.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd257de5e---gatuzojesokududadulerifin.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8758f456---zigipikaferike.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097017eb07da---15580684604.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9e5e79afbd03cd92ee2d9d823cd2ef48/bopokodotulafisa.pdf
    • https://zivotzaokny.eu/res/file/gajosunulezudoguvowi.pdf
    • http://www.sudaff.com/pics/file/jetuwetesatix.pdf
    • http://nhadatv.com/webroot/img/files/wirarune.pdf
    • http://kochamsushi.pl/UserFiles/file/mimonak.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5ckedk010alfd4qmrrt5fsiqbl/96762534260.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2299eba03---gimufefevepo.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f48661b1---lunewe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gastroparesis+symptoms+in+adults
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 16792 bytes
font_01_sfnt_off00010bdd.bin
d5fd04a82ddb7758963bbf6393f6fa2894cc4769874b954af199a88fb8df70ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 16896 bytes
font_02_sfnt_off000137c6.bin
6207eb43c35eb1b978fca84af012ec741b5cf9af827742ac6dab6782db354812
pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 10804 bytes