Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f63c81dc30b9195…

MALICIOUS

PDF

83.5 KB Created: 2021-08-12 19:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84980078401770603eaecdf5dcc11cda SHA-1: a0d0b04a1be2e2c8cc4f4f034e1faaa7b73613c1 SHA-256: 2f63c81dc30b9195f28e38dd6347f7e24011acd213010cdc7352fdb506ecb6f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://steklo-shik.ru/userfiles/file/kobonododejilebogupu.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609a95e3436c3---20600827098.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec54ceda3---temofirexabe.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a2078f3764e48b01d64fccb5b4fc5615/94452595373.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a39348d1---delavikozasugu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c7f4b77f---41493689580.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/kujatidusupafidifigex.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087694a8d595---69650730519.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/502ed4d101f4d65d09377f8cc62948f2/75703916858.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bf2f70cd254f1a43d938384eb08906fe/nobekobubozura.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac01e14d6---26359407585.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/87912609774.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2cc0a31dc9313976b609c32bd7ffe07a/dewobolaserojusawinos.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f078fadd997---nitigubagujupufir.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/rerezuradavotokev.pdf
    • http://angelescare.com/userfiles/file/50261945145.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/23772868244.pdf
    • https://clubkdo.fr/img/pics/files/39230868329.pdf
    • http://piazzademarini3ge.com/userfiles/files/wexijemimoruzelekunesaso.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160832c0443f55---powabururazefakotupe.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ddf450b6de1e9677c5cb2d436d018d37/jusijifezator.pdf
    • http://ersatzmonitor.de/userfiles/file/35860970174.pdf
    • https://pharmawell.eu/ckfinder/userfiles/files/42859388404.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/molavujovolibagaw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=slither.io+private+server+unblocked
    • 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_off0000dea5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 16792 bytes
font_01_sfnt_off0000f6bc.bin
8aba3b3cb968dbef60800675cdf24525bdce936152975b188bf0c254c513574f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 11148 bytes
font_02_sfnt_off0001107d.bin
b441f665e30ac39eccf5c8e9ea3e340fd636965bf81eaeb4104e8dbe124c825a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 17700 bytes