Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ed08c8b99cd5cd…

MALICIOUS

PDF

91.4 KB Created: 2021-08-20 15:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1c9b81fde06c07cd79e2753decd62e3 SHA-1: 6f7d0285e40de32d2533b9f7d4fa0bc05104952c SHA-256: 70ed08c8b99cd5cd45a6d94b0698966386ba9fffe428655cc69e36261391f90a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1caf43e898---96855973777.pdf
    • http://tvtamminhphat.com/uploads/userfiles/file/rapoxezejepikero.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/nniriombifncjbtrplqrsqnu93/dasekafatasijuxokumav.pdf
    • https://sunridgecorp.com/uploads//files/202108061513064787.pdf
    • http://tokstar.com/_UploadFile/Images/file/pulatuwazojefafejivobig.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072705522c55---perigurab.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/59681484a89f4dd3b7452c020ee5ab4a/walitel.pdf
    • http://comlark.ru/userfiles/files/dotubiraxive.pdf
    • http://yaeram.com/userData/board/file/40872890094.pdf
    • https://domilot.com/uploader/files/3092605785.pdf
    • http://wsm.hk/images/uploadfiles/file/7646996830.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/jofumifogadobog.pdf
    • https://kolbandibileklik.com/resimler/files/84275774226.pdf
    • http://www.dilipprabhavalkar.com/images/file/3601585977.pdf
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/59900985365.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf30ca37f---wiwuvirarerivalupobufimi.pdf
    • http://backupcenters.com/userfiles/file/91096268190.pdf
    • http://tdsns.ru/userfiles/file/97351270878.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/junuzap.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/339f2eff8fdb9d44b3204440de6116d1/zopokabetalez.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608446b67dc51---rizebezuta.pdf
    • http://urduhadith.org/survey/userfiles/files/pisepupugales.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/57c0276eb0a4b7db700535165bcb1842/bemewebinebagoris.pdf
    • http://www.monts.sk/upload_images/file/mekipanotawowi.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/4ca40f95e92e232f3c0b479ac8206ee5/50742864874.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fiche+exercices+calcul+litt%C3%A9ral+3%C3%A8me
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ab.bin
6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 16100 bytes
font_01_sfnt_off0000f9ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 16792 bytes
font_02_sfnt_off000111ff.bin
cad6e819f5e7b81b34204fed563d90823f99a2516d08fa526381046281fca729
pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 20020 bytes
font_03_sfnt_off0001437a.bin
18750ad8f2d553b97aa54514b1a21f513e7e13a360747a4e64065b580557204a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1437A 10932 bytes