Malicious PDF — malware analysis report

Static analysis result for SHA-256 5094f7c26a676946…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 12:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d52e126b084ba3abc93e16f0cbac8345 SHA-1: 281d99e49bbcb3fa2051ca0ac3a16f27a0f8cdca SHA-256: 5094f7c26a67694687efd4ad474999c9599a5d8b84e884e8442ff5eef510c5b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cintabogor.com/Uploads/userfiles/files/retixisugujod.pdf
    • https://autoroman-service.ro/imagini_ws/75113865262.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160816d1f2874b---55122278092.pdf
    • https://100tmt.com/uploadimage/files/20210623023341.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607339c4c02c2---62732346363.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9fa25721c---32299813848.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b4c0dd2d19d388e1870585f48fae0f5c/90263900688.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/60d472000bc4188a01f7e4340c903388/38651604370.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa05de1091c---debexo.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0aed6ff0---49948419480.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/dbdf17633f91b73587e684e489886e1f/12489151830.pdf
    • https://kildevangen.dk/files/wufituxupejikozozewede.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc63e068b6---ribarofetiwotoronutodu.pdf
    • http://goodslib.com/userfiles/files/zagewiwodosazomubusoxegim.pdf
    • http://botosani.ro/img/uploads/file/22688009787.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076905821092---gutuzexezexulesos.pdf
    • http://vtvxm.vn/userfiles/file/3111869274.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/17213de4c2bbd035b1f99d1029c12eb7/lizorizulovimenupum.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1bfcace2c490b8293955f3222e02e251/82326711362.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/gg74nj2cp3iipnm15fqopgsd8e/14531754001.pdf
    • http://obasekiestates.com/UserFiles/file/69330903840.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff3c18ea04---zalaleza.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tell+me+about+yourself+for+a+fresh+graduate
    • 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_off0000f3e3.bin
4bc85937eacc1b6cb92e82784c7038a25bfa7568f572d3e1e886a66faf48ea6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 17452 bytes
font_01_sfnt_off00012179.bin
c101a78983800be9d48dba805bd8bd57ba5773e9383cd4b8d8a5ea4c960debbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 10924 bytes
font_02_sfnt_off00013aa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 16792 bytes