Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cef8b77ead0e2c0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 03:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f857f4a7a187f8fdbb455d31472d6189 SHA-1: 101b673acff3c1ec2c545d605bb1f9111264d97d SHA-256: 0cef8b77ead0e2c00051b85f07313216e6b4b865d6b2af58f2be1ee364cde868
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the phishing pretext, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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 https://huntic.ru/uplcv?utm_term=monopoly+chance+and+community+chest+cards+printable PDF link annotation
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851458eb811---74705606766.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07eee293b---55223905238.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/31715458700.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b964d1a6ed0---81762797545.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/tidupesarejinisi.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/27527253275.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/fonimoxi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb9485016d---44377706322.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/20401514294.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/75580786601.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00be4e3d5f---naxudunorofevaxominasonun.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4afbc29c2c69772f8db3687cc40d8d62/40418053372.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/57560198744.pdfIn PDF document text
    • https://dm288.com/slicice/file/61601315590.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/33252503731.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xujebozawagixaxi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22da5431d8---2186259898.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/nusivemexuwesobupelale.pdfIn PDF document text
    • https://termoformat.md/img/files/43872366331.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16105e16ed56bd---1327468197.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/69312864831.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/xapotojetafed.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/o3agkhloac1aouuo0mjrq4c220/naruxuvuxav.pdfIn PDF document text
    • 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_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 18528 bytes
SHA-256: 5cafbd3cb9ee7aff22e3605a8b9be3ad405c01b484591c8ea8eb855fe58b7031
font_01_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E67 11128 bytes
SHA-256: 509ebab709bf260f15e535a6ba948204debe71e6a1392a9adc85e28034d763c8

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