Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8263a1aaba48f9a…

MALICIOUS

PDF

75.1 KB Created: 2021-06-27 00:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3198432578b5ca0af56c09f224c3dc0d SHA-1: b9d9a2564d7da53cedce664bfd216bf1b31dccf3 SHA-256: c8263a1aaba48f9ac6ad1631710c5f630930499876ff7f777b1b33001a7bf7cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to potentially malicious websites. The presence of ClamAV detection and ML classifier flagging strongly suggests malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document structure itself points to a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://krisoc.ru/uplcv?utm_term=advanced+trainer+test+3+answers
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9lhk9ca7kbbjh07imjhd518roc/nitegekizulawomofozilo.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747785bdc4e---3349184215.pdf
    • https://cardion.dk/gfx/fckimages/file/nupalefotawolezaki.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8991782a4---risekuluri.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/de3af4e7685fc915d4fab47a21b3fe9f/43908009406.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8352ec9a---2038561465.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ff1d4005421cd81c0d30bba58026c5bd/gexunijawonuwojofizexixaj.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ah544eibigvgtjiqfj822tlnv3/5739772964.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/754da01b45398d50388c1fc4fbe0f8b2/95543171355.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/lenedeni.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/j7d163evd76520mgk66bvg2vcg/goximopijututo.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mg4cmqpievosblp29j0uelguv4/88287798864.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c36cb639a641ba444bf4c2774065440a/rijetofulapabusigus.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4db3c594---9771354360.pdf
    • http://amuseonline.com/absite/userfiles/file/4685719967.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/220b90858e236ea9c5c85339e6140afa/39215645317.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7d07e0289---xemuteza.pdf
    • http://rainbowcaterers.in/userfiles/file/97550668713.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609479efd1cec---nedala.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/412b1d064019e15a1a13de53865fa710/vudixodubevax.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/s82888sp4d0relbeo9cr57v2gm/goritonogazalavizo.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9178733799cb14182a2ab31d5c1b68b3/tixekaguzax.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/am1fcttdn6vptetltahfcjgcku/78464273560.pdf
    • http://mistral-paints.cz/userfiles/files/21263394562.pdf
    • https://soechi.com/userfiles/file/77099890232.pdf
    • http://kinel-hunter.ru/upfiles/file/78472227148.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bde0.bin
4504c38bb34ab2ebc0e7c1d511946c5b00f53ae44fa5b85fac070076a8164fbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE0 10500 bytes
font_01_sfnt_off0000d601.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 16792 bytes
font_02_sfnt_off0000ee13.bin
82a2047c7e4713cb06774ed19922d382cd22315520a957689d706ed49babd29e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 18728 bytes