Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc65a1160cce06a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-23 00:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7326b0aef56631f9638284936b7803e1 SHA-1: 95dcf58b072fcbd903900a59a4742515337360ea SHA-256: dbc65a1160cce06a43407665ab739f9ee133033c74ead7ffaba3b6e7f4559249
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The document is image-heavy and contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://angel-conference.org/upload_fck/file/2021-9-9/20210909052216999796.pdf In PDF document text
    • http://espokebar.com/uploads/files/suxiwarezizufuvijataz.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/kigelon.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/lewidifapuninulixot.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/fevosogusaxisudakejoduz.pdfIn PDF document text
    • https://vleek.com/uploads/files/53290780663.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/77526765848.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/14739569236.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/sokove.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6bf2bb0891b86ffe4cfca6381d5b7c70/jodek.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/bidaruwirotokukowibapusa.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a0e7f8d9de473e29247f4f01481359e9/sesusozu.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/kelepakoxe.pdfIn PDF document text
    • http://hkacca.com/userfiles/xugupegafudunuzowapepoxu.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/golirakulogopusile.pdfIn PDF document text
    • https://guijek.com/userfiles/file/17936417776.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/zigoruvugumumajipavex.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/jiwilozibabu.pdfIn PDF document text
    • http://effektfilm.de/files/file/jakapesunudaji.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/winexalixipotineruzeger.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/15031292939.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/21871953131.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/nemupumedo.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/goxoden.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b569476219---92876292438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kingroot+free+download+for+android+8.0PDF 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 14060 bytes
SHA-256: c4259f8934c69991733c9ee40f1ef01648461234504038dad4f2e2868559cb30
font_01_sfnt_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 10836 bytes
SHA-256: 5bd01b550e2f6dfad81edb59f4510fe8b7ed82ab580018bc54cf9bb24e496ec9