Malicious PDF — malware analysis report

Static analysis result for SHA-256 47394b8985d824c3…

MALICIOUS

PDF

80.7 KB Created: 2021-08-03 13:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab35ee1e73e8699dbef01e8dad3108f4 SHA-1: 7bb78353670c1caf583e551ad06949853e9825f4 SHA-256: 47394b8985d824c3dc6e520a6308e7f73a0439d6b152c621c1796b11878415ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=9.+s%C4%B1n%C4%B1f+fizik+kuvvet+ve+hareket+yaz%C4%B1l%C4%B1+sorular%C4%B1 PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f37f5c407cf---5587992242.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160920794194d6---nupabunodo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cd8ed1df7---tetulubiniwerixomum.pdfIn PDF document text
    • http://status.cz/UserFiles/File/85049270596.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c0f20c81---7358938077.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610615596ab76---rikodeziposopudanesemavi.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b6bb752217a3e1f25a652afb574ad09b/45095284200.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rolibrvp05hcpef4e40m9mrdm4/25386474069.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/53264525628.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/260fbc7e90d217b599cb1b30cdb46f0f/mopirolemotejinoxuge.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/94486514427.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/96010838102.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/9899403389.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/94073792569.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098916ccbf87---fopisoba.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/xidusudebibidowemape.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1288936242---18978504179.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d7b2e6aea1aa1070165fcd17709b126c/gadasemekukanede.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/kadupogukuxelana.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/samozezenagejoxivuxifar.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/39191357956.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb33718f26---39688065641.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/39869748325.pdfIn PDF document text
    • http://promador.pl/userfiles/file/38504985375.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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 18344 bytes
SHA-256: dfa50e7fde22e8e4f4f9a5ee76b33b030748e4a42d06d354649fc64d3fd8ee0f
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 10924 bytes
SHA-256: daf31d38f1eb54af220020369e19d3650c937d7a0f99b95b6ae2ea0fd199a4f5