Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fe1691b24b25d8…

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 01:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11894f02e4da59906712396171576da6 SHA-1: 9d2d7bb3c83efbc622ba3e308a5551f012d35b3d SHA-256: d7fe1691b24b25d8611ef70346384e781ecbe4f8f22f2f7deee1b1b4f46ea0a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=hope+all+is+well+at+your+end
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f085ad865b---nobimewes.pdf
    • https://uleshuzataruhaz.hu/files/file/xorafaromokirunaxedalexe.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/03e8b40eb98b6140d51b3784012744f5/jewaf.pdf
    • https://aymfly.com/aym_image/files/96357741919.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/rv705jkdlpc46dhpj0r3o7qgqm/kuzesosidojanutakonor.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c50841eef2c---mizopozatixibuv.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8586aa2d12---92428996740.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609619167ee44---lagudonugodegas.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/apdvnhjgi6l4suonh857tth7u9/mofijazagiwovinije.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/libejuxogoxixupe.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/kschh5pd9ml24b6opm8p4fi6i2/nubosuwuxolu.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39c788b78---puwolatofegaga.pdf
    • http://hasici-pristroje-eshop.cz/files/file/74752851857.pdf
    • http://klubalfa.org/img/userfiles/file/774509889.pdf
    • http://bigband-ulm.de/userfiles/files/94923085885.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c3e7ce3ca---67788584936.pdf
    • https://alteanetworks.fr/img/file/jetefuwupu.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1cad57d22---68571968012.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8611f08---98814842166.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7gc53m0hk0cvtgp6km8t2j46ai/81422803132.pdf
    • http://fine-cottage.ru/userfiles/file/tasetibe.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/33e1f3f3e77dac9e21e83a086ee4062a/6198531750.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7f55c609f---22049567764.pdf
    • http://contrast.no/ckfinder/userfiles/files/lazimoguwoturitujawu.pdf
    • 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_off0000e4b1.bin
ff44b16d1edc595bce6a0e720ba4133645b69028d45fb561a47a5bcaded8c424
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 10676 bytes
font_01_sfnt_off0000fd4c.bin
d513f9ae065a2bedf41d80994bbc8e695ad72962ae8eb39c9b83b58d7ebcc13c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 18132 bytes
font_02_sfnt_off00012aba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABA 16792 bytes