Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec98f0f9bc5bf8bd…

MALICIOUS

PDF

95.4 KB Created: 2021-06-30 03:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b58d5a43bb6a1545239d589b51db1d30 SHA-1: 54fb24cf6927d5715b7c6a4806aa66cd89965fea SHA-256: ec98f0f9bc5bf8bd18ba7715ed7f746e8b5927a2397cc9d89fff84c7a6727642
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=pisces+man+and+aries+woman+in+bed
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb6e946ee---70878983720.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5b278a42df6c2cd23444d968c693d5a0/23251561629.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e5320c09b077e45d7531a7ec8efb77e0/12677666334.pdf
    • http://qkmedica.com/uploads/userfiles/file/65966452262.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/fc0e2fd937b946b8970087c57da38631/29623149918.pdf
    • https://eternalbliss.net/file/54293107327.pdf
    • http://studioriggio.it/userfiles/files/zuwefivosodi.pdf
    • https://ka-base.no/images_content/file/texadotonidadiwir.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ab5e1e86f720f1c12c0bf12e09d9a769/kelulomijaxuzokaduv.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43ad15de9---kodevogasafem.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608029407140f---makup.pdf
    • http://gyobel.itpublic/file/35128030288.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae2b6f29d---lufizarid.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/q366u8f3fvto6n9go9he69lhi6/jazaweliworevamididamuluv.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/440b02448a4844bc837f32edb55feca6/35067117049.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9e4d94c1f8283fad69c29411166574d1/figegizegebumoponakib.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/93577667518.pdf
    • http://eurolocal.info/sites/default/files/images/file/12211327753.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d912e57d9d24ccf2ac60e1a662560861/janumodomibo.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/37840115e3f043e540fc01cf54b2de2d/35190099514.pdf
    • https://hse.tw/upload/file/59030460113.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/pazupoge.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c5ed8964---89247376976.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 16792 bytes
font_01_sfnt_off0001164c.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16164 bytes
font_02_sfnt_off00012bbe.bin
136a9b2f939793fff158e9245bffb368af1edf136a089ec96f4aa99a8d30ba61
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 16868 bytes
font_03_sfnt_off00015782.bin
19baa07f90f25784d0df20c82beefceffae36f173270a7ee9a901118a05cabf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15782 10612 bytes