Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9186f5eafa88f2e…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 01:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1759d0fec9b6b0ef24ee27e714bbd4d SHA-1: 1aedd7fdebe4087a964d24108e6ee29bc3229665 SHA-256: c9186f5eafa88f2e7277b4ad337fcf10c059522749599d5a4c2e6f93aae576bd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, a common tactic for phishing campaigns. It contains numerous links to external domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gazosilikatnn.ru/uploads/files/satikametulivogemixedalur.pdf
    • http://studiophotosfashion.it/userfiles/files/94065850250.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ac269da7f4f96df44abdfa4ec7b857c6/luwenejisatadufizumopi.pdf
    • http://greenearthgardens.org/userfiles/sigomizitatefiloxedife.pdf
    • https://corpusbg.com/files/fck/file/diweliroxarijumuve.pdf
    • http://homeloanz.net/images/e/file/mitotow.pdf
    • http://dailycan.com/userfiles/files/77059472545.pdf
    • http://aromaonly1.com/yamituki-n/uploads/files/vorulivoxanete.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1994edfab---naperi.pdf
    • https://sreekanakananda.com/ckfinder/userfiles/files/88187907535.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9358d00fe---21448837445.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f921f3a06b---60405476288.pdf
    • http://rulife.ru/ckfinder/userfiles/files/72176868367.pdf
    • http://tsnpharma.com/upload/files/74321134653.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jt2isd3dp1v79loumec4o17nlm/4908038058.pdf
    • http://limoride.net/gallery/file/tugonudovivebazemigufeg.pdf
    • http://www.facyt.com.ar/ckfinder/userfiles/files/lagavovizedetan.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb2cae68cf---40804191792.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/17261026294.pdf
    • http://staceyasp.com/UserFiles/file/kusepikigunij.pdf
    • http://hongphuc.vn/userfiles/file/rajubisabejumiwisafokix.pdf
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/zezipujesixomeku.pdf
    • https://chennothinterios.com/uploads/file/48256816919.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=carbon+dioxide+in+water
    • 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_off0000b224.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB224 16792 bytes
font_01_sfnt_off0000ca36.bin
683636c484f6baeda2bb0b8d569ba8c8fc06a444ca584b734488a434b2738c2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA36 14180 bytes
font_02_sfnt_off0000ed40.bin
dffca2301f8535bae4ab70f15e505c116cad1dbf33e104aa5e2c22b98dcb6bb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10388 bytes