Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c499c60fa8ea9ed…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 23:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 144c086c96b1431562b0e8be9e2036a4 SHA-1: a9a5d0092a7fab0ea526ea81c9880ad8ff025169 SHA-256: 9c499c60fa8ea9ed022ff6e4c7afcec10f39ad044be2e859d56b5430f69a0748
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious content. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://abaj.cz/UserFiles/File/98918017209.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0b74c750---88580229105.pdfIn PDF document text
    • http://cabini.it/userfiles/files/kegemawumazinofekixu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a116aef6c0---84508449073.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/mowoxevisuwugavotipa.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094845a5c0f5---votezagolot.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160772186d4ad2---beziwovawinivavakekuzegu.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/muwefonasewa.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/90678530903.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/damedup.pdfIn PDF document text
    • https://slide-bearing.com/d/files/gixofozomupape.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e4akudk4pt8e4s756on1ef7p2k/61644988019.pdfIn PDF document text
    • http://www.bandungmesin.com/file/timurerowemekixuxoru.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9eaa92f2fd---tatisebaxi.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/iotl8glb79k9h7gicpevhh00l5/nobuzukuvafokeguwuka.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210728_766950B428290DA1.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/filovibig.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/93668176329.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/jejojuvabanogazoxelodifo.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/konojogitapoxoxij.pdfIn PDF document text
    • http://tchid.net/userfiles/file/57804438459.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/10af5fbba1ac52879721e3eb635dfef7/nogeriwi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/10893482688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=letters+to+numbersPDF link annotation
    • 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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 17124 bytes
SHA-256: 94765b24cd2281f35009f3689587b645e3029f322100e047285ae91c3029117e
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 10168 bytes
SHA-256: 7818f7a112639acab9bc0e0672e3234dbc70663720b7ac398581a33c28494fc1
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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