Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a1d34b1d64a06…

MALICIOUS

PDF

88.1 KB Created: 2021-07-05 07:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1207f85f0b4fe2869b8f38e699092ce3 SHA-1: 14aaa920070b00fa03de9c082739458fc52036cf SHA-256: 3f8a1d34b1d64a0648c03e13b8e033a80e014f323511465566ef45636e87f7a4
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 numerous compromised WordPress sites, many of which host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/74a405ce2e13a4f2b0d8a06fe32eb094/67558068868.pdf
    • https://balustrady-metalik.pl/files/xeradawig.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce363e966b---ditifef.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6af814ee39f842ad5d55e06c21b49373/jadevi.pdf
    • https://baxsporthorses.nl/userfiles/file/42170907479.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/5905137652.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3d37780bb---sozovumibekaw.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfddd2375---91549633514.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/si8dr8aaqfcjaaq16qim4rlu3n/32546735522.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/073a60d85a281be5f322fe26a78aab18/64275781901.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2012661704---76234128220.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5489a3c7---84662563585.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48b8d0b3---nenofelofizemagutaxu.pdf
    • http://farmaciafoglia.eu/userfiles/files/firinapabimepumifizeluj.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/542ef0ka1hrrvb3nf56vka008d/libabakatuzexizagijazali.pdf
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/gazizuzimamutuwu.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad46cc0a4fa---xebewojag.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8827c84d78c68ceadbe709656285c0f4/37586731592.pdf
    • http://paitoonbox.com/userfiles/files/80666771294.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e2178c2576a58d064e8159c8e246abfd/kajoburenonivarufali.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52027f74f---kapavurekox.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/328bpns9563m6cg2k2o93rn906/7012576928.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076ddc8ee057---laguvoweduxowiwawezo.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8tm2b1ddpt0ekbc4chtcur7fpo/basojuseset.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=little+house+on+the+prairie+season+10+look+back+to+yesterday
    • 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_off0000f467.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 16792 bytes
font_01_sfnt_off00010c79.bin
260bb645c091eedf04ccb5c9628f83a33bb694a6d0a0e3bac4a96f4bb0dc9cde
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 17124 bytes
font_02_sfnt_off000138d1.bin
ef8f5f9833cf80d0c50e6f7c9b1056cd43f56834a53af43488d53e541e4ba86e
pdf-font-stream PDF embedded font (sfnt) at offset 0x138D1 11188 bytes