Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3392718b1e85eff…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 09:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b199c07af51bd8d96e3a00a7b6626df SHA-1: b408171cfc5a3510fa8f93874da0f36bc93419fd SHA-256: d3392718b1e85eff3d143a494176bd3ab3cdc720d521d400bb5bb028fdab3287
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://go2germany.ru/files/file/vanesakutojovoze.pdf
    • http://giftboxvietthuy.com/upload/ck/files/jifili.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/946e7d93911abed4bdd0eea19ebd4586/zoxijatugafa.pdf
    • http://gasasosong.com/upload/fckeditor/file/lomikafugiteru.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607def4215c4c---7429189895.pdf
    • http://apothepharma.com/upload/files/xineladibiserepomipiwaxig.pdf
    • http://mateuszkucharski.pl/admin/file/wamolukujinerenales.pdf
    • http://ikkosushi.com/uploads/files/68666400183.pdf
    • http://chaukitchen.com/uploads/files/dejofulikuzugukunu.pdf
    • https://aprenda-atdi.com/uploads/files/ridesubatuzikuvuvexubo.pdf
    • http://avanti-kuhni.ru/upload/files/925314613.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9btke9ji4g0cfu956sieaug8m6/7486232475.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160965679dabca---75462000083.pdf
    • http://mg001.cn/upload_fck/file/2021-5-17/20210517031143978986.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6pf80e8obqciv3q1dpd34mr3m7/zimusalotetak.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/wajuza.pdf
    • http://gesundezellen.de/neu/userfiles/file/76559874891.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac0bbe388---xodidozozenotopaxidogup.pdf
    • http://veno2.com/upload/48567892879.pdf
    • http://cafehinglung.com/uploads/files/96192171363.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/df0f2a3221ef65b2fe1637c1e581b8ed/22714028729.pdf
    • http://kamerton.nl/clientfiles/nixemefijonujafonu.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3234dfd69082e751c1aa00c4c5afb9ec/52343858707.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=definition+of+ineptly
    • 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_off0000d02a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 16792 bytes
font_01_sfnt_off0000e83c.bin
900f19084fa21853be28f4963a9e693681c083c3034d5c45904448e472c5f66f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 22564 bytes
font_02_sfnt_off0001235a.bin
a7be6bfe32050a83d1f0e83c9082843332ac37ace9b8b3c830cee6a46431a112
pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 10036 bytes