Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7f4e1e3cc46818…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 10:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23dd1f9c62b0e61d5ae0779013dd148f SHA-1: 47de8a147c02ba0eb90d90b1b024fbe6b94d145b SHA-256: 6c7f4e1e3cc468180f3fa03eef8f1540485adb285e31b4888c608edfbd483487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, which are likely used to host malicious content or redirect users to phishing sites. The presence of these links suggests an attempt to lure users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ucs2u5ah59pq413h1l4mjvpbio/mukomudodubuxalofo.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2584aa344---tisonukewupebupuzugomi.pdf
    • http://shortguycentral.com/ck_uploads/files/96408448783.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/26eb7873cf568faf987d6a595812df82/60250793588.pdf
    • http://lactopad.com/uploads/files/wigabukomeg.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/bosobinusojizixol.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8a7d63df165c134ef42939b1589671e7/54405707100.pdf
    • http://theonejsc.com/userfiles/file/2891804451.pdf
    • https://nonbodepsg.com/uploads/files/94140881180.pdf
    • http://ancoraeducacion.com/images/87856924463.pdf
    • https://seikai.jp/free_images/files/41747483242.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d6a2e8c2---81835291604.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdadd47c58b---zamos.pdf
    • https://lee-trading.tw/archive/upload/files/96818394407.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610744f7b6175---wubarapasukimafemu.pdf
    • http://maybomnuocdanang.com/uploads/image/files/60253381631.pdf
    • https://emmaushuis.org/pages/70554621723.pdf
    • https://mamo-tato.ro/userfiles/file/40559659188.pdf
    • http://pogotowienaukowe.com/Upload/file/42208064237.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161212d60f3884---63120092439.pdf
    • http://totoquynhhuong.com/upload/files/95163477090.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tnehsbjgva6et2rf9mvtharmf5/rogikuzujex.pdf
    • https://kibledergisi.net/resimler/files/xopixigexekabatemasowupa.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/taxadudaronapubor.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced308d898---81550764672.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fuerteventura+road+map+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_off0000e354.bin
1d316321d7df584017a5b24053373d4fd6096a14ede407c61f73639812fde7a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 17864 bytes
font_01_sfnt_off0001111f.bin
3ab525b80e83dab8cc3da1a1b35dd0c6db2690e61fe71f382b5eda4bdd1130eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 10496 bytes
font_02_sfnt_off000128f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 16792 bytes