Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec1981f6c31bf68…

MALICIOUS

PDF

85.2 KB Created: 2021-07-15 17:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: acc640b3d5d23583d5f049ae4ff75003 SHA-1: de514fa477b0d6f136710b21a3eb582e701c481e SHA-256: 9ec1981f6c31bf68a204015f6204e3f9b553ffff1cd6c1297ca73103338ad4c7
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 websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=traits+for+personality PDF link annotation
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ugiad9rj862va6vfjb2equjmte/guxagomaruzuzil.pdfIn PDF document text
    • http://salt17.com/userfiles/files/41695997768.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/15682033132.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/nababaxewefu.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/79366326134.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd107f59359---tewezedegupi.pdfIn PDF document text
    • http://foodchemsino.com/d/files/19577175588.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/aface0e012f9f22dc1cb561d9564f512/jopasadasoxi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609568b93e111---muwowodutizezumupabiluwu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1cikrt3em6seomtgd9c4hnqf1t/rafolifexubin.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fac2b9068a8ac7feb332309329db298d/97857150687.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/o485eaj0dodsmoa3cjssc2ubp6/kurinapuwigiwu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f00581fb---27075968954.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607838e9c67be---bafokigemikipedefizajivo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bff640d3d7d---88309092367.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a1ce1012b077eebea5375ca1288f6a2c/rixejifokeb.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af921e9b116---xizudizev.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6vvvv50heal5ao4ss9iq20sqf7/jagelujudesoxajatu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/60215617178.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6e6f0932968bc01c91b611482704a449/bugug.pdfIn PDF document text
    • http://kme-kme.cz/files/file/zoxisusozogalilomas.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/30446035771.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/95225543905.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f2671b922c4a0b1c6c4c6b0f037f0201/71513757971.pdfIn PDF document text
    • http://tatennis.ca/clients/29257/File/30306912724.pdfIn PDF document text
    • 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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 10428 bytes
SHA-256: b49db7b208838a331728c736471177bef1fbd7a0a6125c83a116067ea3629d63
font_02_sfnt_off00011a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 17332 bytes
SHA-256: a088de0c6652eb02b1e3db23af4d41e868cb72703b06a216a2dd24e1762f1016