Malicious PDF — malware analysis report

Static analysis result for SHA-256 661dbb26ee55d663…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 23:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 940dfda6afc0dc9e6651170e1f39f945 SHA-1: ab54b78e40c1bc0588a351275ef807de705bd1b8 SHA-256: 661dbb26ee55d6633c97bc8afd660853b9ac10b96e8a3519b868717a1b686502
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://odlingfamily.com/userfiles/file/riketigagobukajexebudino.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0ecc6fa30---40811164268.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/85614574478.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ds6p53brlv9i10kv2h12d63jt4/lolilupedosa.pdf
    • https://alamansyria.com/userfiles/file/morozuverol.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/66ej1u7c3aai6u4kf2dtcimfi5/bazaterijevomebozokimuva.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd786e2d1c4---1947550408.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d6aa97b57fb6a5355d5a01e667afc8a4/gasuwutesezozokusaxeb.pdf
    • http://matsonconstruction.net/userfiles/file/55320079154.pdf
    • http://voxel-avocats.fr/uploads/file/zagidopupowatasin.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/8974963377.pdf
    • http://odontoflash.eu/userfiles/files/reregonabu.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ee57fd550cf15605384f927286e20744/resowipinojawe.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4c7e04492b3da5beefb2f9b3a3874253/17655075606.pdf
    • http://luluscafeonline.com/uploads/files/xezomilumolazivaweneviv.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ac23a94842da6e8e065e6691d95d0280/66843356657.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4733a56d7f32d98c50b908b8127a9562/kiraroxadaso.pdf
    • http://sakem.org/userfiles/files/benodonudarimamuto.pdf
    • http://herve-coiffure.ci/files/razekijafepezovaxefem.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/rojodutapanisajomebuki.pdf
    • http://1utilaje.ro/mm/file/64977187559.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+games+on+the+internet
    • 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_off0000d840.bin
d7b63eec60b0cce12b12df8e516d464d662ceb174873a283c0198866cf31114b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 17160 bytes
font_01_sfnt_off00010468.bin
0bbb3322904a7d2f7c19c8355498b762c1b64ebf89f5f3f300dc0e879c0015b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 10488 bytes
font_02_sfnt_off00011c09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes