Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56eadf3c0d7b53c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 08:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8cf74814893be6ccacc0d94abf0a2eb9 SHA-1: 077952311c30db5577ac7183b84bba45d40ad0d0 SHA-256: f56eadf3c0d7b53c9694746f0ec72528f5f75dbd3df7f637ef964d1f5f5b8853
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a strong intent to distribute malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=how+to+export+call+logs+from+android PDF link annotation
    • http://esteel.my/userfiles/file/45829503811.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/02664b77a0f920bf8d6e6eac878528a0/guxenubelitipemel.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kovilabuli.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/62938381876.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/t2su66e7bblnsuhsgoanrs1r9u/67756766614.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631777806sadalur.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/fefabevoma.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/17847628599.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sajozol.pdfIn PDF document text
    • https://rubfila.in/files/file/54948143065.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/riwutafupelusesuj.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/jebafuvesaguvolugataneb.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-14/images/files/bunapomokabejojozitujesaz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146c109a2c8b---75125990858.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/38538543547.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/paxogo.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/nemijaroxuguvubisedazoje.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/41638999812.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613603f514c8b---kugomixiparu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cdf097311---88729619580.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/fivolob.pdfIn PDF document text
    • http://klenderbio.com/upload/files/65709555568.pdfIn PDF document text
    • http://finchamauto.com/pics/49604731374.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/60237993296.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161439261c69de---lidulejegusedixutev.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614235f16f903---68073275993.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_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 11144 bytes
SHA-256: 9589aa5ba2aa92017e55cb754aa29114aca1734dd51c7dec9954a23b607e68a5
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 17040 bytes
SHA-256: d24ff425586717c153c99f11309bc96f00a6c635dd10691576ba17d920d4d6df