Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acc20e672be15eb…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 20:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a375d18e8500fd7dbf8de85bd8849add SHA-1: e9b43e15444a1b6bce1f4d4a1290b829b92d2e9b SHA-256: 4acc20e672be15ebae4e04026db8fd580bccb2d7d6b91d0920e60ad0780de9bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d1fba9503a460c7f2fdf77eadd8cf3b2/18659062380.pdf
    • https://duragloss.pl/userfiles/file/dovijulixaboviwafimu.pdf
    • http://crosswaysrecruitment.com/userfiles/file/tafenewimepoganafer.pdf
    • https://tumujerrusa.com/userfiles/dalujapatokesifisaj.pdf
    • http://pretaporter-pegah.com/userfiles/file/takalimititexuven.pdf
    • http://stin-verdon.fr/assets/Image/files/4774849925.pdf
    • http://maslag.eu/userfiles/file/70510450211.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nekajewotelitilato.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f009956bf3a3b61b632c6340a7b01310/bokaf.pdf
    • https://bahispesinde.com/gnc/veri/_files/ruzekowa.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/15683629360.pdf
    • http://vuonlan.vn/data/upload/files/44620476857.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/6268755793.pdf
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/pikigifesal.pdf
    • http://toptoptraining.ru/img/upload/file/3819430251.pdf
    • http://adhunikjewellers.com/ckfinder/userfiles/files/verasabotijapudidaruxevit.pdf
    • https://llbyggodesign.se/UserFiles/files/88404847031.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/n3oph0qorfgeddp9q1i03tigp4/77875601747.pdf
    • http://antichigelsi.it/userfiles/files/bijozosuxa.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/3219918111.pdf
    • https://pmsp-me.com/userfiles/files/tefapuvowozoxipodusa.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/85387748132.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=classic+contra+apk
    • 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_off0000ca7b.bin
0e163bf6c1665f556a41ff8c32979f1e322973c6ff984aea14a2ca07763b2920
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 10360 bytes
font_01_sfnt_off0000e202.bin
537271f6f9076dd62791500056ccae30dfaa799a583474bfcba454c382e8d666
pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 19528 bytes
font_02_sfnt_off000114dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes