Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd036cb7bc92105a…

MALICIOUS

PDF

81.9 KB Created: 2021-06-27 13:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 214d5c0b701277754b42b514985f8803 SHA-1: bc573c711c5704e4eb06166602fa5b660f1d12b7 SHA-256: bd036cb7bc92105a952d0a6c84195f234f82a950e3ac6412fe4a47586f09388c
176 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of external URIs and link farms points towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://irlanc.ru/uplcv?utm_term=grade+12+life+science+exam+papers+and+memos+2012
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/q4odv3dp9ok6cqfi86lu7iuvdc/32007813432.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cd2b7f368---puxujetorun.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/wajitesulipubot.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cf4378dc1fce71105913da990e12bf5c/mixavapifarakamawemeduwap.pdf
    • https://binarbaid.com/public_html/userfiles/file/monobiviwaxe.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de457c0e4---94924933981.pdf
    • http://russia-ex.com/27734383583.pdf
    • http://planetamama.ru/files/file/parilusamo.pdf
    • http://harchovyk.com/userfiles/file/mufexebobex.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89274214b8---70129173723.pdf
    • http://allycatering.com/userfiles/54695389740.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/fvnv9ia5todnvemvpbeel2oj88/18030031178.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/016fc64de377a7cb33555d6770917938/9681201892.pdf
    • https://33mobility.net/uploads/files/foduneja.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430df9765a---86684809872.pdf
    • https://atlastoursntravels.com/userfiles/file/4983605597.pdf
    • http://kimkhimientrung.com/uploads/image/files/dukofi.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fc0fcf8964d28d11b36504ab7e45262a/zonunuxaximuzujulilapisa.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d503cd8eb---nupazu.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/83332460470.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/au8nf5p5m853rvap0bb9ng564j/83567176037.pdf
    • http://montaze.org/democms/userfiles/file/lupifuwusalo.pdf
    • https://seripin.com/calisma2/files/uploads/tirobisaxivekuxaxifepaf.pdf
    • https://alianzatours.com/imagenes/file/72376854444.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914c405b510---rodabakisonelifakuve.pdf
    • 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_off0000da33.bin
1a473727becca220a617bc9c07597b30b85fa96c4ab137e8076d183b8679c4c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 17280 bytes
font_01_sfnt_off000107b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 16792 bytes
font_02_sfnt_off00011fcd.bin
2a0f67d63e3916aed72370566ae0bddfcddc43136725c33614cea208cd01c4e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 11120 bytes