Malicious PDF — malware analysis report

Static analysis result for SHA-256 568331cf4b4efb49…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 17:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed09e222e04e09bc7943f884ac5b4ef9 SHA-1: 45040477affb7704ad2bc5ed4fabbd83987a5ea3 SHA-256: 568331cf4b4efb494666956c36a1d6f932a81902aa7435e20c5c9843dfedcf11
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain obfuscated commands or paths, further supporting a malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://garglob.ru/uplcv?utm_term=mac+android+apps PDF link annotation
    • http://premiumcsp.com/uploads/files/wirelenoxos.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/banotuzekitadobopogaz.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0586a75c1---86317080177.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613188c97c478---1434515071.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/lofufulosunuxetituv.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/jakevafe.pdfIn PDF document text
    • https://csn-alliance.com/data/files/gopikomuxajajajazixewijo.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/gebonusuv.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/55440878387.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/9560028790.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210909_DE99C114E0B9A302.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/42631526557.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ug1cdotgogh33td27cmd2hifp4/38169261846.pdfIn PDF document text
    • http://carbontuning.ru/file/10847632122.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/muvujunapeva.pdfIn macro / runtime command snippet
    • http://korealabels.com/ckfinder/userfiles/files/musejiwiguwi.pdfIn macro / runtime command snippet
    • http://sicilalluminio.it/userfiles/files/52889892517.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/xesufedizodijedakod.pdfIn PDF document text
    • http://esistore.be/userfiles/file/25907887657.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/wubemewawijizodujaxurun.pdfIn PDF document text
    • http://mousike.it/img_ins/files/61426406699.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109161255051400.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/poguwujijaviwomobuvag.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/penet.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614067bf2cad9---50810493354.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161429c95b141a---xinujajafogesaperigenen.pdfIn PDF document text
    • http://carbontuning.ru/file/108476In 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_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 17204 bytes
SHA-256: ff01b4ff39894aac7cac460cb2d0b4a0216931498eb17e84e71ebb318412530c
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 10224 bytes
SHA-256: 2d6dfdfdc220e2efe6676a900f44dc6fb3f79a2adc96d941a329a96b664126f0
font_02_sfnt_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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