Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3266f7a522c9d9…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 17:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ecb080af389a21d38973c5e3e83d009 SHA-1: d570193424a0a51d66493fe208b8852af8c200c3 SHA-256: cf3266f7a522c9d902e50e49bf12f70c0a94ba89f31046956e5ec8124387f94b
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 upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://maxtarget.by/ckfinder/userfiles/files/repanujelar.pdf
    • https://tylbm.com/Upload/ckeditor/files/24384573315.pdf
    • https://festival.bg/fckeditorfiles/file/gebenuwekapawas.pdf
    • http://chickenwild.com/upload/contents/images/images/nixijikovexaxewumomon.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160820c5ed50c0---vujusorategerovodoxar.pdf
    • https://unserbiokorb.ch/userfiles/file/47876426457.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/25df630ab4aea6d7355c5e97df7f2ccb/sidazumepodupem.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/gojiwimabefaj.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d84a6a944---xokonixebifofosezi.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa1038bed---wutexutumexuvatuxed.pdf
    • https://firsatpin.com/calisma2/files/uploads/tizulexuge.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kmn5lerupk01kjl1kmuh1uc5i3/zezoxawinoruboro.pdf
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/kerudu.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f350d9cf939d19a00cdc102a97210d58/6029663691.pdf
    • http://fipjp.com/userfiles/file/65382567792.pdf
    • http://musikpark-live.de/userfiles/file/47277930955.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c33e6b2d43---71670015868.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9c964e21---litazovita.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f38eeb21---sujaruxurewugo.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad2349f9b---kelonuto.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9e65c7d2---72526007702.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096819175ef4---nibojisekaviwobefeja.pdf
    • http://birzebbugastpetersfc.com/files/file/sifidog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=down+the+rat+hole
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ed613bb21259ecf65595983cb4cce04c/milepomizisesipijanokiwi.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_off0000f50e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 16792 bytes
font_01_sfnt_off00010d20.bin
9c89995d2baeb2b1456e294c962957395996270b4d57f6d2db7a36893a7153b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 16632 bytes
font_02_sfnt_off0001388d.bin
4a558d43cfa7295fc2cb63d325d62348f16c843366d1d98c2ab35a18e8bcfb6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1388D 10032 bytes