Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff2dc55eee96d8d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 05:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a67fad0ca53eb0787c614801e2969674 SHA-1: ba94c4263403e7a202f9763a59326994aafe8b26 SHA-256: 0ff2dc55eee96d8d96a7137c906607655fb9169f48cf2a3ef1af2da0b884b4a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=enable+usb+debugging+via+recovery PDF link annotation
    • http://romengo.com/ckfinder/userfiles/files/98919640747.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/gixofibologozojuwakex.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/44236920278.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/15718871018.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/pipufegudu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0773e6a6---45652088293.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67412045242.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/mubiwafofezeze.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/51204871941.pdfIn PDF document text
    • https://dacola.com/upload/files/22883527943.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/29410082327.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c62c21c56---56923532067.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/12694566242.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/rilamifevavejefip.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3f0b086b717ee936c049778eef278d9c/52757841747.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/15157419634.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/28209795551.pdfIn PDF document text
    • http://ktcz.eu/files/files/14326421821.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/lirulozulatewamagovo.pdfIn PDF document text
    • https://combrooncom.com/contents/files/wugojufukuwek.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/55830034531.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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 17500 bytes
SHA-256: 5c3944c1635c1296a27d9e045f7abeb6bd295524d4fa6b11c2157ce21efe2b35
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 10852 bytes
SHA-256: f62145965ae1e35d6c9e35473f395448bff2c718d4118a1dade11d3e15acadc4