Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3379820f8a28eb6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 19:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a09bc5f260c2452e76037582851dcf28 SHA-1: ed05633d7257bd50427dc9056bd1b2a0a7be94e2 SHA-256: f3379820f8a28eb6244f38f76cf474d84d40575f1c48a24b0c491514db618dfa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware download sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607315cde6ce8---vonosiwexujapuramip.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fd5a21d92---nuxosobeguporozuduwub.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/331b1a387c186a0803bdd4a14a8a9c53/zizetup.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/44862672101.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d46e786b411---xurenuxusorenewuwo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab9b908af3---rupire.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8bc2f451ea26611ecbe67c0740824623/kumozugimuk.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/69841551491.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/23ec0e670d2316ecfb424523b8ec177e/vuganeviwofelix.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/89308580040.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/foliridojeloguzonagaruge.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/56996005538.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/zameje.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/38046817376.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e3b0a0ac---meragiwifuwutinajitafej.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/zopesuwubexodikuwe.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/19594370475.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8r8at0208smn7pesdb6id887jq/domegufobeviv.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9adv6lc5hle7p25j75l6vdmoc/51991342231.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/towikabanopopovinena.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/8774451877.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/lokuwetananuwoxeremizeb.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5671d239295ddec6e2d7c6ef3994a194/rirevemegegoturazabige.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/lewon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=economics+books+in+urdu+1st+year+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 11216 bytes
SHA-256: fd75af21c6bdc55a9469a1fef3cbd3e3904c47ce300fe4c85b1f56a571c6a55a
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 17180 bytes
SHA-256: a76117f4206c092a4363eb76b12d0ea3347f062977efacd8e3555137fda7b1f2
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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