Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9471541000e35a…

MALICIOUS

PDF

72.6 KB Created: 2021-07-08 03:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ee90009cea289e5b2a9f033c90b1c55 SHA-1: 44c79f5b533ef37999350245d3f1ca62f50432b5 SHA-256: 8f9471541000e35a18380cf139dc0c649a6ccefb143ee2aaaba108c014d99b5e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lucchetta.net/userfiles/files/82041796220.pdf
    • https://contabil-fiscal.ro/mm/file/59621934913.pdf
    • http://merwepizza.com/upload/file/rakunexaxibiruzofubixudap.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a692b5b08d---73478403631.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/kd99oh5go3lvsencjsmfgpu9u5/44508871257.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160724de19b831---kefozisi.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/933d620d93a96bb2918248894e09b80f/97915657712.pdf
    • http://bethanybaptistcolumbus.org/clients/75549/File/jukel.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0012933439a7185fe39716c52a66116/zotoxetagisubef.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608640ad0c927---wenir.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6d8a8de25fe50e2d195fa197b1b94a7d/95882301610.pdf
    • http://learningkey.org/userfiles/binekufokesoja.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096280f84065---86052310305.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777b441a732---koposavexulororabi.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/2e41ec7b0e28be01862cbf0233afddb6/guzeta.pdf
    • https://clickkedai.com/userfiles/file/73952210894.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/99168399981.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/af905d97f3e1a63be05b561c71740e97/zovemuxafutorarowime.pdf
    • https://alshaabcoop.com/userfiles/file/20124709086.pdf
    • http://jinistudy.com/_UploadFile/Images/file/luzedikalimelizukagobar.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe78b49dae---7408728505.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/407d777e7f4b0fcf4ef8c21abb8fb5df/gadedidumenopivikimiri.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086612ba1424---65784167240.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9353b6988---pabamenotamobewetolexa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=usasexguide+eastern+shore
    • 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_off0000bbff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFF 16792 bytes
font_01_sfnt_off0000d416.bin
3bb963d44757d235076052ee6cf17897f15a8d81d24cbadb5b9c5254688d9b69
pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 10692 bytes
font_02_sfnt_off0000ec5c.bin
2231c096ddbb7af7c3837dd7f65dfa8fea7b3c7571b5b0dd1c8b29ae8f202843
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 15744 bytes