Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70dd35999bf8a02…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 05:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fa5fc0511b14b71f4041b396927ebde SHA-1: d4879684b7dba76255a0378fca7966430c38f4b5 SHA-256: a70dd35999bf8a02bfc74743aa1403b2328e15fa242d33dca09e9986a0621d8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=pubg+uc+hack+generator PDF link annotation
    • https://pacantioquia.org/aym_image/files/29069820695.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/sadegalavinokujexupefutow.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/suzasaporugobama.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/vugap.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/vegadilefu.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/62398348668.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210918074834.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139842f6ea90---5533492558.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/1928077344.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/rolowi.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210919_79F11DAA53F77AAF.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/55971954394.pdfIn PDF document text
    • http://scsytech.com/upload/files/67084486029.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/86347048613.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79364734a---28865180473.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/wojubewapugibinitulupalor.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/22502930389.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/kenodivogi.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_000459.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/zudumexirimadagelupesil.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493e9821600---juxinigiliz.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/debakufusimapibesovarabox.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/toguboda.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/48906214490.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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 10536 bytes
SHA-256: 48895cd69f086569ef67c8e5b0df81f2323bdee4adf7e60af28c73cd40cadfd2
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 17208 bytes
SHA-256: 2d01fbcd33f3fee772f66c69e04d57082440f93f058fb3bdc07105c9244aeb87
font_02_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1