Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c63d6ee171e8e3b…

MALICIOUS

PDF

70.7 KB Created: 2021-06-29 23:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c30595b8bf8cacd91bfa0daf237901d1 SHA-1: 58399c43ea78ea43db1dbebf020918e2ededb6c5 SHA-256: 5c63d6ee171e8e3b1d10196e607269b1dda2bfccb42d193e8c99c2fdbcd9ee81
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edbda3d14---76768405394.pdf
    • https://balaji-technology.com/userfiles/file/80432761988.pdf
    • https://plentis.eu/ckfinder/userfiles/files/jewobew.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf3b370c6---sofiwekunuxizenover.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/62ecfc89606fdf99b3faf50fdac657fd/39992956672.pdf
    • https://webmenuplus.com/images/file/nonag.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079b08e704fe---libewadibimaxegira.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc204e32e5a---guwako.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/10a55897034459252c5ce26032fd070c/gupexirinoxisumekeji.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160944a8add5b1---mirivevipur.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a736ef3f481---46832486290.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077050e3a3a3---6701416730.pdf
    • https://congchung7.com/upload/file/fimojebafosefa.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/zajugeja.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c675894c1---50829131921.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ojd6m2ehcrva20bj42a5rt7jfs/5188261586.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09726458b---38274650293.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082592083895---dazuvilazokabasuniletun.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86fca81b8e---sutejinozedafifa.pdf
    • https://vibanghanoi.com/uploads/files/45109173071.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3884e89ad3---41822294368.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nelson+chemistry+11+textbook
    • 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_off0000b597.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB597 16792 bytes
font_01_sfnt_off0000cda9.bin
93f29af95f149a142184b663d15da25e21dd61366af015c129ff877157e73a11
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 15492 bytes
font_02_sfnt_off0000f4fb.bin
e4aa71de06a7bd0f781ee253d011bb8522945fad656b612ea5274263b5fd3e71
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 10808 bytes