Malicious PDF — malware analysis report

Static analysis result for SHA-256 affa486eb3b6b2be…

MALICIOUS

PDF

82.9 KB Created: 2021-06-29 08:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 926eb701bc9992aa156c355368fc13dc SHA-1: 05ef23eba840ad03b7d96a6afd16fb37d62a197a SHA-256: affa486eb3b6b2be9523d193ee46cadc69bfaa60cd869a66d9baf9d1791cee63
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external resources, many of which point to compromised websites or disposable hosting, suggesting a link farm intended to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://learningkey.org/userfiles/88090429868.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pk01u0thlodmnpl4vf7ul3f067/tepikozutaxozumirasafomi.pdf
    • http://www.findvoters.com/userfiles/file/95258141557.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/52068640725.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/90371c7c5bd00028613991c8d813c1dc/51974143908.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/gijobifumodojagobajopebur.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/64212505039.pdf
    • http://islandpointfl.com/userimages/66215678029.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/74055505717.pdf
    • https://mdteam.se/ckfinder/userfiles/files/kujisugikozawupopile.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/78fa4ed8976e06617de95e3bebe6abc0/57190398132.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c199e9e145e---xelinovixesakoxusibowof.pdf
    • http://shosholoza.de/file/3351965340.pdf
    • https://ladangmimpi.com/contents//files/96047759780.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6049beb1c0---bovotolewaxumega.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9bee74c81---88960627743.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6e8d0bac90679988129b58e38c1317d4/41979403175.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c99b48afd50---65755599918.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f11e3585317391960fcf1bbd167d696f/butonibewodixabuxig.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9micl9o5jqigjr5gs29m3fo5c0/21825716487.pdf
    • http://czdashan.cn/uploadfile/file/2021051722084573499.pdf
    • http://magnachip.cn/userfiles/file/20210512092842.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c904717cdb29c0217c1bac859cefe42c/dologi.pdf
    • http://guides2alpes.fr/uploads/file/tepokowidexagizabuli.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/xilovud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rokka+braves+of+the+six+flowers+flamie
    • 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_off0000e0be.bin
2cf997863e58d432f20c222789c245a096561e4966f4a9f5521720d8bfda2fcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 16792 bytes
font_01_sfnt_off00010c9c.bin
0e119888685bb2d5338178fea8e033990f5b58b9b69237e23d48fe51e1f2b81f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 10904 bytes
font_02_sfnt_off000125ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FF 16792 bytes