Malicious PDF — malware analysis report

Static analysis result for SHA-256 854bb870762a9903…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 20:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45264bade2308168ba1bb068ed853740 SHA-1: 60ba0fe76c97bdc9977367798875f72cb4728612 SHA-256: 854bb870762a9903bfdd77eac86bbc2bdf21a0d4929dcd6cdc16ec37053de1f8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=polymer+drilling+mud+pdf PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611e9fa093aff---16977081739.pdfIn PDF document text
    • http://pasted-radio.de/web/files/jevozigapotitobuboxisabe.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913e2ea77f7---10237656196.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xapobixoperemoso.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210615161449_gv0dsa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b0769faf---puzoletuvo.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021073003127_1025687690.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/20594294483.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070aec9475c6---jaxofiwol.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/82654629111.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/11951998418.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/55866576645.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba4ff34ab---sexomoxinamafedisituw.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f82fa5af35e---91618701906.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/14902006882.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/37092803253.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/75274192413.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c909e93ca2067117cdc29404994b1c30/kiwotezavuli.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/15515739904.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/43bd86e9eeacc0487c2cb61fc54bf112/29357014773.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/mabitorusonujipibogovuban.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce110ffe8---wekinuzoletuvivolapod.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ff14ac67db4---xuvuli.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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 10628 bytes
SHA-256: 86d2cfe6dc76fc8ba2fe52d70eb0e802d9d105d393f3b62903a70578371023ec
font_02_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 17140 bytes
SHA-256: 5948d1b1508601a7f2766559cd2d05d547ed55899a149d2eab1d22179909fae8

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