Malicious PDF — malware analysis report

Static analysis result for SHA-256 273a6998a6718497…

MALICIOUS

PDF

79.0 KB Created: 2021-07-01 10:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9db175d8e82535c149c54ab060d39111 SHA-1: 8bf92bafce6e78819134cef49c35720e478b9470 SHA-256: 273a6998a67184970860a67d7b437d7d5c3cf0bea582b424d7e6f4c166efcd3a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users to malicious content. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chcial.ru/uplcv?utm_term=how+to+fish+harvest+moon+light+of+hope+switch
    • http://alphaconsultinggroup.us/vpw/images/file/pivisudojupiwakagizewunuz.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d7b824072---sesitulol.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/e288ae88fecff93d854832fe334b9f1d/robodejanafefatub.pdf
    • https://guruamardaspublicschool.com/userfiles/files/73829349346.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a063a470a---mitidixijejuxekopevow.pdf
    • http://geoodwierty.pl/files/file/48248328113.pdf
    • https://angkoronetour.com/userfiles/file/boximifus.pdf
    • http://xn--xhq021fvrwdth.com/d/files/kovoredinilawerirut.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58542623d---21309981952.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607433bcba6c8---22419037519.pdf
    • http://decamiones.com/userfiles/file/13771763770.pdf
    • http://jhferry.com/data/fckeditor/file///2611625703.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/stofica72up7prje3idn8s2gki/18344793575.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada4688bf4---7589887032.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/db1001cbf270465e679974fd23b2539d/zarupulurapavare.pdf
    • http://testplanet.nl/uploads/files/girilaxewolurowi.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c8cc9d9b---merukov.pdf
    • https://greenfuturevietnam.com/Upload/files/812236781.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ceecf3b92---dikiwazozesiropaj.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a558fc3d---50051667719.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/verosapavapa.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfe8e9f0c---12562056525.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5ddf0877a51da02c0abd17b997d88bdb/teburek.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_off0000d286.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 16792 bytes
font_01_sfnt_off0000ea9d.bin
6a8a83ae04dcbc2206b44909121c462aa1f8a8f2c724726802e03b6fd8d84b15
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 11072 bytes
font_02_sfnt_off00010444.bin
5525f42eb313b98e891d16841fe645728a1a584ffd0d86410a50017d0cf82a1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 16388 bytes