Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab6797b79acab6a…

MALICIOUS

PDF

114.2 KB Created: 2021-07-22 02:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8299d796981a195104ec5cc3d11d5573 SHA-1: a8f2ea0689623142c78ac1f0ae37e09987afdda3 SHA-256: 9ab6797b79acab6a4b5c19608988eb6ba4eff7f29d008e95b6f6fc8ef4e26518
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Clipboard command execution lure' heuristic suggests the document instructs users to copy and paste commands into a shell, a common technique for downloading and executing secondary payloads. Numerous URLs pointing to potentially compromised or disposable hosting were extracted, further supporting a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://tokyoracing.hu/userfiles/file/doputifigupukemubil.pdf In PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/laradexoxodoparuluvidum.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/vixudowok.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/74511627821.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/vavipudobo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9375814b---xapasazonabusuzuxol.pdfIn PDF document text
    • http://unseretochter.com/images/file/jakapid.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/44969946869.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/580adb4994f4027c7ce250fca21ad72d/ponuw.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/73136255252.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9l2ps18kdt8fge4bnh1logdtog/lizijapupefomozikete.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/64937016285.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160841f514bea7---donuponunasupekebinem.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/033ef64a929329ac248c9461762aa043/gubalosu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3207da163---sisenibigezupejexuxofas.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/woxulibud.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722433c4930---gunoxipojagitoka.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a4a239ae---24574970862.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac879c962bb---xopasomegudixuwot.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ruvawamidubimi.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/41457174904.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f61200a70---suvajejiferuzaf.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ddac85d03cbe5463f8e706aa8d3f7a7/jotuzowusomukemisibip.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add5bc10943---25300184163.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/pobewegadowuvud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gameloop+latest+version+2020+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFA 19088 bytes
SHA-256: d76dfa66532843b70f3ed649fe815a2dc5c9fea42edff7337482b1530bcd8ac3
font_01_sfnt_off000171b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B3 11092 bytes
SHA-256: e9a4d71ce26728ab4915db969e4f27d4ad3f3913939a8a0db57ae3bced831e74
font_02_sfnt_off00018b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B9E 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off0001a11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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