Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c55169d27111161…

MALICIOUS

PDF

91.9 KB Created: 2021-08-06 07:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c197d455a64c041032e7da36bd00792a SHA-1: 4592b8ed5eb54f2fd4750909c60c9627d80a09c6 SHA-256: 2c55169d27111161448ec262a661bf8082771ec52a859a5ce62b41b5fca889db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/25562767795.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/8ff2d09de7eefdc323ea4a75ce5dd5d5/vuxikurefoviton.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aae5e76f3.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c7be2033bc791b789da45aeecf079e6a/16717574528.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/getedonijenebuze.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/30751685807.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/m8cfi8cckiicch7ihtk78krq17/zukizubifafekemobewepadax.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0da909742---56216304983.pdf
    • https://barcelona-health.com/files/galeria/files/ligalax.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802bcddded3---47196040479.pdf
    • http://www.hgbehringer.de/img/files/files/zibawuzofebukasudazukijab.pdf
    • http://dolphinegypt.net/userfiles/file/zetejus.pdf
    • https://sambelteri.com/contents//files/ravojodi.pdf
    • http://fine-cottage.ru/userfiles/files/sagak.pdf
    • http://gayaarchi.com/userfiles/file/20210728164608.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/cac02bac635a8f1d6ba6b63456de25cb/timopulegojup.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/21970306548.pdf
    • https://mcdpiti.com/userfiles/files/tixibaridewaje.pdf
    • http://nnhs1964.com/clients/a/a2/a2d7b74ded15306de89ee4bbe2f7ed3f/File/zitupinolakugalipewukupej.pdf
    • https://cortemadera.com/wysiwygfiles/file/mufuwuwoliw.pdf
    • http://tuclubcr.com/campannas/file/73279357492.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/26b870f821fd70730eb10048eb7333fa/64996057256.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16106ccc333b02---68390350019.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/835ade158473bfa7c53a1770508813c1/patuloponures.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c76eaabcc1---fivisego.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=libro+caballo+de+troya+1+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e7.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 16140 bytes
font_01_sfnt_off0000ff5f.bin
f7086d6e7a945b3bbb74f81b37f2fdcb017ef55dac61bc4e48fc56119ab01afc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 18484 bytes
font_02_sfnt_off00012f37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 16792 bytes
font_03_sfnt_off0001474e.bin
7a23869022ac2930b841801c5ffef149df058e2b216d96961f4d8f916173d7f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1474E 10604 bytes