Malicious PDF — malware analysis report

Static analysis result for SHA-256 2679a387920351d4…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 23:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b5f0278981942e13dd3d8949948a7ee SHA-1: 734524da6076cbcc804389e136b5e423189d853a SHA-256: 2679a387920351d432220cbe131065aadd7338688d76a61746bac4eab0da5a61
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sashtraayurveda.com/ckfinder/userfiles/files/dopulizit.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/45628092756.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a946867b230---maxupibabijazamoro.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1d22621446c47403bd336ed19bdf607/43974887122.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ced8c680a4ad4ea9ef55e68da846c37c/rafojagotusaveb.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/49769296683.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/cc1863c801d17f7ed405a5845bfa5a09/jagazefisabenizazujato.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606edcd2063c6---kexawebaporajusizadi.pdf
    • http://nowator-zpu.pl/userfiles/file/632523752.pdf
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/54954169303.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c0b5416d9d8d15d8d1201e4ccbc25573/tuporixidijibi.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/01212255a66186c74989c777fe99b3ce/78283004418.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e4f5d807---35926087879.pdf
    • https://sweetburden.com/upload/users/files/54504083975.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/35v15akdsd015m1uj0queopv17/58690863975.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/kemexowizoroxawivireja.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16081869332fc4---nejerutujijesik.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dd6637f4e5bfd61d087ac32b4e371492/53957442152.pdf
    • http://www.aportecnica.com/imagenes/editor/file/38147493625.pdf
    • http://ainut.fi/userfiles/file/kolasibuzuda.pdf
    • http://ingmontagna.com/userfiles/files/10978983445.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/65339376418.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=scilly+isles+prince+charles
    • 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_off0000ee8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
font_01_sfnt_off0001069e.bin
d0d86baca96cfa97748b8f3c7be58e9ff5934ebd10ee936cc2a859de5753cee7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 17404 bytes
font_02_sfnt_off00013420.bin
e7303d2e1d77f38eea7ec7c3e935fcdcdb6b53bf31c4c23705571bb9e7266c72
pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 10444 bytes