Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc879ef154400bf…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 22:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a4fe20b2c1b3c5d7d7979c209046aa67 SHA-1: fed82db83239ea472d8c44131fcdcb87f26f25eb SHA-256: 8fc879ef154400bfeca1c899962151b65b13e137991681eda96b0c34e3e979a2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and the classification as a 'Phishing Trojan' strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=liam+payne+and+naomi+campbell PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b3cfc0bf1---lusevexubume.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/jukewisomed.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/91743027775.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/jajefefizefibedorasivomi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b44d057638d03daad687ecb3b0594d6e/69242907598.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/78977842388.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/7517ea2bf927ed90d8a0b4cf15709969/kutinunutawemotawo.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc4a5c820---86448973967.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/14829532359.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/32605024388.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9849ba6a---balazi.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/76105917477.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b550f8d62f557a8edd50ec070bd1a53f/babizuluvas.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/59804307802.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/4565320475.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/6088556570.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16203256371484.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9c8d5b3167b7bba9d25ed807a2fa07ed/jevemuzipanuwulot.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/cdldkbenrrg65d46q0t3coqjk4/95279340501.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894abf71045---54623014989.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/feruvilikujolokanegiweji.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e4c5d2774fb6bd83835532667373f09e/jugafobasaxepenisuroli.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609260daa77af---milanapetixep.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_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 10520 bytes
SHA-256: 6d93adf1d984ad265348a9cf6d4d6fe7abb84c04dfaa98b9b2cade80eaf4b9fd
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 19180 bytes
SHA-256: c6f43cf79607c4058a7b11f3cedc829a39bc7a1600e462f3fce89711b3b4221c

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