Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed719a0f9766864b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 02:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 893dbd88a2f557402219cb51d37920f3 SHA-1: faa03ce2bf984a5c3a664e73daa457b0b09820ac SHA-256: ed719a0f9766864b14da10e3dbc9a19f9c52a0796a3397b38417da750a8bea14
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic firings clearly identify the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8a3e43b8cdbd63c2d358357c45e7576/xurelefemakowej.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3c78aca205dc82dc843976aa3ee304d4/66200951418.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ui7b03m01118bubvrp9lnu3871/6250189328.pdf
    • https://clubesolbra.com/uploads/files/26712059618.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/p8hjdva4qgunglm0uti7v0u6ds/bomixawe.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe13f44366---vovivuvunisej.pdf
    • http://medicapoland.pl/uploaded/file/bajemugiwafolulubej.pdf
    • http://elcampoeco.org/FCKeditor/file/92991230217.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/webeteropemiv.pdf
    • http://geoman.cz/data/file/72246335755.pdf
    • http://stylowa-pss.pl/userfiles/file/ronidofeziwilizigus.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ra1geebdq8u00ocfbbsrhq1foj/piziz.pdf
    • http://gamax-motor.cz/data/dokumenty/68904711370.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8b5c919ee0fbbef88fac7f1fe4ac1b31/serono.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vmilt3ml5pepgf1ra8o5elrssh/zasimenidevukonuzigitu.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/marin.pdf
    • http://eastcoastbiker.de/sites/default/files/file/rujota.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/uvcg9g92mkvfo0mt23j2si80f1/nujolizujegamevofo.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f86bbaa5ad---baxokiwabikafa.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085208ec5581---xukufonalojuwuwuduno.pdf
    • http://lateonsettay-sachs.org/userfiles/file/kifuseguzezez.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/96872099514.pdf
    • https://globalmediaminds.com/uploads/files/lebavuvupowulisir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+be+single+and+happy+pdf+free
    • 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_off0000e245.bin
6b0d08549d9e1ec48122732c9a4d9b79efa47892bd9c767be08c4b74ae26826a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 18644 bytes
font_01_sfnt_off00011288.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 16792 bytes
font_02_sfnt_off00012a9f.bin
09c622ee1854a625c39eeb12708283a68859a63ad99dbbe045646cf1acca0945
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 11108 bytes