Malicious PDF — malware analysis report

Static analysis result for SHA-256 a789586f07356ca1…

MALICIOUS

PDF

109.3 KB Created: 2021-07-26 12:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e1ffe603f239e96a2ee4f2961ec617c SHA-1: d1f29f434fe2e1ad095a2afa2b1219aed13e9eb9 SHA-256: a789586f07356ca134bf2da043f7d7a2cdb67921dd635aa45c378ddf6f7e05cf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/pqnvbnn239cp9q4g6k2vfmgtdk/wozelilagurumatej.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/91079711440.pdf
    • http://kasintorn.com/images/upload/files/25329272359.pdf
    • https://martensmgt.com/business_school/uploads/file/31602529396.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1c18b38b1916f6c9afa6a2322043d998/vurizazuxilefarorudosobe.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c940c44c952---5687348390.pdf
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/45379843761.pdf
    • http://dalaichau.com/files/tewunofilodemufagixujuz.pdf
    • https://home-consult.lu/userfiles/files/61019486646.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16072484a67dfc---sadafenasiminulazafajowot.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d81f4af17---47300965804.pdf
    • http://holzbau-napetschnig.at/wamabimatewid.pdf
    • http://salt17.com/userfiles/files/50565104030.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/lilakegi.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b760b0dc84c---gomerujekoxedopixol.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160edee41ee298---juzajozejima.pdf
    • https://tenfci.org/userfiles/file/17725616230.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/fadaketikesadomekomowapo.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/dogat.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/35658f130e094cd850ab6ffcd89040bd/5512123957.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55586df21---dubimovilowufefituduga.pdf
    • https://feng-shuiworld.com/userfiles/file/navegagafebawirolijiwa.pdf
    • http://abpaluso.com/upload/file/sekigabodusafikokel.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9ad7baacb---vepelinetojepujexe.pdf
    • http://dansungsala.com/uploads/files/83115972443.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=harry+potter+y+el+prisionero+de+azkaban+pel%C3%ADcula+completa+youtube
    • 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_off000127bd.bin
b2c9bb1e9bcc990ffb6d981c917ac7b534804cb03eecbd4cb4e497b3216e32ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 16524 bytes
font_01_sfnt_off00013eb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB7 16792 bytes
font_02_sfnt_off000156ce.bin
53925f9fd35498467ee5a5829aacfb5f4a9feb3e841094116dfebc7f43d68a57
pdf-font-stream PDF embedded font (sfnt) at offset 0x156CE 11236 bytes
font_03_sfnt_off000170e2.bin
1aed30f1fd421cd05b0ad01218061986a69621e61bb3020efadefdfa8cb7ba37
pdf-font-stream PDF embedded font (sfnt) at offset 0x170E2 19400 bytes