Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3d9ff2652ef0d8…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 00:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5635a8b004a7dd05b42862af68cc5bb1 SHA-1: 2c914c53c1f2a423499e3c8b6d9a4d3aeb472d9a SHA-256: ff3d9ff2652ef0d8b3cd14523fe0818d29dc18bcaae38f980d044811f56db35c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit users through these links. The file's structure as a link farm on disposable hosting further supports its use in malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=what+does+it+mean+to+square+a+number
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7149daccc---73104662382.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef3a466ba---24661531063.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3b5ac3e0---vorabetupedigekilu.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec22c7925d---kidigotodix.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f15b9164---waluwotebajenena.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/tuwadaduwerujidoveruradun.pdf
    • http://alimentosldm.com/userfiles/file/gisibuxewumofep.pdf
    • https://bselink.com/userfiles/file/famepurulax.pdf
    • http://bigandtallking.com/userfiles/file/sisurexivavufulelixinijad.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sogekejolunivebenelawij.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792911c4d3---9308657010.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7q7u2oleq34v2rjf61eueu1ah2/zudowafikufoduxazoxav.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a6c3bd2a---mabotavimokisir.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2245de0f93---wolazilibiloduwiwan.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ec47d0d24bbb11c5ceed7f689430c06e/68518537361.pdf
    • http://x04ydivan.ru/userfiles/file/rurekena.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23dfbbf79---bezovigeneguza.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a0462e97de121a7711d33c37fd34991f/76330638884.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/bininefugatibuzanogewod.pdf
    • http://rubensova16.cz/files/file/38175232129.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca15eec52b---66638135933.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/0ecbbdc91a59eb4baa4c2df1dc378177/buzugilifajepakuki.pdf
    • https://transport-vehicules.fr/userfiles/file/vomolonedabukovilu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccb.bin
89855cf0bee91d03ab71c2dd6b70a8bd1497a40f04505ad23c70b88d040ed2a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 10844 bytes
font_01_sfnt_off00010575.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 16792 bytes
font_02_sfnt_off00011d87.bin
da6a68de4423a7f96ac02e31fbc38ebfd00a3b306139bccc71ff8491f8b0cf80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 18184 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.