Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8736c8ab4d0493…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 14:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0bccc43ec884ad9027091a700e8470b SHA-1: 26fa66b46e0d2816c33d061dfdc4185a88ddb8c0 SHA-256: 4e8736c8ab4d049302f5044d279e502af836cf0e294530176d3c2d1cc884946b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and URL patterns suggest it's designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe40fc2633---jokagiweniwokulonepiwovam.pdf
    • https://kanalprofi.at/UserFiles/file/60520119064.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c894c8af4---63180717167.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c214fab26e3---rarekanedudawote.pdf
    • https://sport-jicin.cz/dokumenty/jepujo.pdf
    • http://buergerforum-tirol.at/file/fujavisaxomo.pdf
    • http://hanarotalk.com/userfiles/file///59204336078.pdf
    • https://hankilfood.com/upfile/files/luzikuk.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087f567d070a---31230319766.pdf
    • http://bitite.lv/media/txt/122/file/1956015362.pdf
    • https://svingenieria.cl/userfiles/file/24925027423.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d1ce9112---28556226928.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945d6cdb432---56990056118.pdf
    • http://manajrgvaaradhi.com/cms-uploads/files/rosujusa.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/87q5fnkg4fjl2m6fffhmnq3usl/vuzedemijitonafo.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/40920084605.pdf
    • https://maviet.vn/upload/files/vanugunamedonibanepati.pdf
    • https://ashleymongolia.mn/uploads/files/74183961202.pdf
    • http://teenaramainc.org/clients/875997/File/58708189991.pdf
    • https://pakistanchristiancongress.org/userfiles/file/1175141474.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pah0vpak25aaohnsuahsnuj3t9/zamemunufini.pdf
    • http://robwalker.net/fckupload/file/rizopoje.pdf
    • http://crosswaysrecruitment.com/userfiles/file/88474261701.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=well+bred+meaning
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vivinulozimaduge.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b642.bin
631ca8c84f01fc1f591e278f46ffe5b63467985ac0bd5d939c135cf401a2b01d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB642 1712 bytes
font_01_sfnt_off0000be5c.bin
38b5ddfdc6d8c047858461635d597a50ba203cfa396bcf59fb9ba5327c511bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5C 20396 bytes
font_02_sfnt_off0000f21a.bin
b80868513b2bb682c3ce7f6661a218e23e1579f638618b39383c7e32e908b375
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10336 bytes
font_03_sfnt_off00010918.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 16792 bytes