Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a6f4130de20e2a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 02:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad0fb086aa1c8319c765524e54506f1c SHA-1: 11a29b48fe677c048a39314888c78ea210c1c15c SHA-256: d9a6f4130de20e2a88e242f4a856419a0d786d1b973f09ef19ca6a573fa0c5cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=de+che+android', are likely used to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt, warranting a high confidence score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=de+che+android
    • https://harkakotony.hu/UserFiles/file/nokijejaruzubesel.pdf
    • http://cbcom.eu/ressource/site-image/files/89247427552.pdf
    • http://maivietnamesecotati.com/uploads/files/vaginodifimelu.pdf
    • https://brincandoeaprendendo.com/fotosempresa/files/45632002012.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/sarurowo.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4587082e906ebda060085b04ef7e96c7/60562408064.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161450f2cb0d9a---57425244351.pdf
    • https://prestinieurope.ch/userfiles/files/tedebunenug.pdf
    • https://aspirecambodia-edu.org/userfiles/file/ripunikofujusefafufikidur.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161408c24a6b51---99312535142.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132226fe529f---xadakiwuvavaxezoviza.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/kolavovenug.pdf
    • https://oriontradecom.com/ckfinder/userfiles/files/zusogejilapegebekus.pdf
    • https://cbconsulting112.ca/userfiles/files/98143600068.pdf
    • http://sanmorales.es/userfiles/files/vetamimovolarilax.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/64132542182.pdf
    • http://ranchobg.com/img/file/88881849575.pdf
    • http://rajskiewakacje.pl/userfiles/file/lonegofebujerizajusoxibi.pdf
    • http://bancasemecanino.com/userfiles/files/jumegakejemasesoporo.pdf
    • http://megaprestige.ru/uploads/files/widipepaxugebomix.pdf
    • http://asfalon.com/__files/file/vevetozopuxetetaguj.pdf
    • http://ch-bovi.com/upload/files/9976213428.pdf
    • http://oasis-inwaste.asia/files/file/80819865354.pdf
    • http://www.lircai.com/web/inline/file/23802384004.pdf
    • http://teusz.pl/UserFiles/file/10291121255.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_off0000e5f6.bin
7338fadb5ffa6636b9e57b34ed20d969b0c1de5d6b3406b64f425590fde3da0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 10156 bytes
font_01_sfnt_off0000fc8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 16792 bytes
font_02_sfnt_off0001149e.bin
5b84740668e46b50d581675716171bcb599284a2214ec0fae40cdce971fd51be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 21348 bytes