Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cf73b46ced4ed6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 19:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b74a770e8e98f0a7db9c54782c77a0fc SHA-1: 96d0aa136d10240ddedc467847e28cba4c0b3b5c SHA-256: c6cf73b46ced4ed6f0357a14c5a14e514103c7f51194eb03e5281f49575d693c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various disposable hosting sites, likely serving as a lure for users to download malware or unwanted software. The presence of 'SE_LOLBIN_RUN_COMMAND' heuristic suggests potential execution of commands, possibly related to downloading and running further payloads from the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://infrive.ru/uplcv?utm_term=instagram+old+version+download+apk PDF link annotation
    • https://gifarlcm.com/upfiles/editor/files/72414502152.pdfIn PDF document text
    • http://qdcmd.com/data/files/zuxizeterujad.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laxeso.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/texomajotuwababijebodilu.pdfIn macro / runtime command snippet
    • http://berallebags.com/UploadFiles/FCKeditor/20210907020907.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1813ad799---5473342452.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/60355925854.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/12839322040.pdfIn PDF document text
    • http://xycrusher.com/d/files/26806578237.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d18b39f77---jimuboninajazu.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/kisabez.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092402502152.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4851d0e6---80935581377.pdfIn PDF document text
    • https://led7.ru/file/76694662187.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/vibonot.pdfIn PDF document text
    • http://mastervin.ru/files/file/fipojekuxupikave.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/jelubi.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zetanix.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/73094922483.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/86670684497.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467d7a8f6ce---vifavokedugomedirudax.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/1647653060.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/49577535192.pdfIn PDF document text
    • http://phyllisrubensteiIn macro / runtime command snippet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB588 10928 bytes
SHA-256: 04ed24801edaf01150a157715a4c8427eb202a017897290a8636f1bb3ef4fd7c
font_01_sfnt_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 17932 bytes
SHA-256: 17035598997f62a1bcc89febbab4705ac7caea2da787066de56b3b3dd904fc18

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