Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9ace58a57d1b0d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 14:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfa085e1134070f309ad853ac912e20f SHA-1: 4891b75ffc616e95c19a974a51e07fc429688f02 SHA-256: bc9ace58a57d1b0d91b4f5a6fb0853f53a94025423c65fc290762e15bd177f3f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain sequences that mimic command execution, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://alsharqcc.com/userfiles/files/lobipekutikon.pdf In PDF document text
    • http://www.ujepites.hu/userfiles/files/77363719262.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/68584923699.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/riwafarinekidufoniwezi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/norilonapejimalinewesaxav.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614251a685019---wivolakepivogugatixozi.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/83300024520.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/51215069993.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/8520157680.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf89c45a4---36164876999.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cef9b79e2---tomamawarasorizu.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/66533100171.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/jikagijatipadij.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/61214972662.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/72271991058.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/61172597006.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/23747141464.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tazerejomadupusudu.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zolegesirafutawisokuvufen.pdfIn PDF document text
    • http://sentai.cc/data/file/20210909_120531_720.pdfIn PDF document text
    • http://handgun.ee/media/file/nuxuxeni.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/24281074711.pdfIn PDF document text
    • http://tercovci.cz/files/file/nisipupefakitoju.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403cb761193---2427950112.pdfIn macro / runtime command snippet
    • http://www.gobarging.com/uploads/textareas/file/muzuxinelif.pdfIn PDF document text
    • http://tercovci.cz/fileIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rustic+farmhouse+bloxburgPDF 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_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 19388 bytes
SHA-256: c90b7239c68d95425ac68f03bb494bd65c01855c3bcecd32e963b4335cc41ec5
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 11064 bytes
SHA-256: f26fe562f742eb8d4e59c6ab64c71fb3d90dd96b9300ea0d5bffb2636d4b975c
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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