Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a777dfdf9d5045…

MALICIOUS

PDF

89.1 KB Created: 2021-07-31 20:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2827bc456e9657133f410a75ad859567 SHA-1: d414a35a9c27c13032b59191cdba296dc3655508 SHA-256: 39a777dfdf9d50457d0a7f1c2ffcba1d8e975f914a7ffd2a238b2e6e8d29c999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the ClamAV detection indicate it is likely a phishing or malware distribution document.

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://smidgel.ru/uplcv?utm_term=92+honda+accord+owners+manual
    • http://yuha.be/_files/file/9839214067.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2aab3a01e---moligigina.pdf
    • http://gpszone.hu/upload/userfiles/file/zitisunesawepezipanovusa.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b329bf3049---molurir.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6ff7cfe81c99f7542547559b9fbb1ba6/97623961432.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a334da50682---wobaxuwagogakulokomajato.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071683fe2fec---57400863378.pdf
    • https://pacpartner.net/images_client//imagesfile/lifupebaxolix.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4fad42fe25602b9b698d53a9e29f3d48/8707246875.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072be692bb4b---34078384527.pdf
    • https://medpressa.ru/files/file/xopemipujebevowixozuvada.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0sg5mbnquic2v2cusuvh3pmma2/43366851753.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160accde56fb37---dawexopomavazetezepovo.pdf
    • http://szakkepzosiklos.hu/upload/file/69086847377.pdf
    • http://rld-carbon.ru/file/81456928404.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c63da4d9ae8---91295665600.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2cbba8a1265a2c0f157544362b0c1b7f/dujoladitizizemupog.pdf
    • http://jyjwqj.com/uploadfile/file///2021061303542545.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e72c357471397084dc7ba5aa3a6ae3f0/tekewinituzijumurivesiwix.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2f8e4bba5dcfe706f81b68323a72a5d5/35818103770.pdf
    • https://biothiennam.com/media/ftp/file/legifefotip.pdf
    • http://xpressup.com/userfiles/file/84999461569.pdf
    • http://www.jucadent.es/ckfinder/userfiles/files/59275771977.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_off0000fa0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 16792 bytes
font_01_sfnt_off0001121c.bin
b8d71fb1b09b4edd5f7dd1fdb65dc4d440796a2869f7f87a54eef4643fffe022
pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 17004 bytes
font_02_sfnt_off00013e5c.bin
5c0ef63208094d714f035803a4003d5f3f5b98f5d5d2841781e725a1d0517e29
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5C 10820 bytes