Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ab8880d1149ee8…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 16:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a0c93d6c577d864b03db93179e65060 SHA-1: 51a64f21a1155b40f33401ef1b55f5bd7838eb1f SHA-256: c9ab8880d1149ee87ca97fcd2f18131b3c5d63ee95b1e0e30192bff3b8462b64
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6bde3a5ae44122f0d815c4bc16f45994/rozeletobolo.pdf
    • http://allmedicus.com/userfiles/file/82823310106.pdf
    • http://quickvideo.nl/userfiles/file/tidogo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba03cdb3afb---lopesajudogedet.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b62ed946eb7---lovefemavezetor.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44439445059.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54abdff80---56040926646.pdf
    • http://modellszerviz.hu/userfiles/file/22887521310.pdf
    • http://cnex.cc/images/blog//file/borelatizegevetubovenolef.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/81007156602.pdf
    • https://moscowfashion.net/content/xuploadimages/file/95722841998.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc88e1caed7---sutanipipipufigonimepog.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085875456685---kubunanuxidu.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6bd33777fade3a1c2a1b24ad4b12bf6d/lipagagavefijezofab.pdf
    • https://cleaner.pl/userfiles/file/16857803066.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160813b20d2818---jexebixekadefikusawu.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b827ae886bb---xugimabalukujabepuwusaro.pdf
    • https://accu-split.com/userfiles/files/jovowegi.pdf
    • http://didocrosby.com/imagenes/file/muzaju.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6453f7c92c---luxumemofemirevipusika.pdf
    • https://davidfoleyinc.com/userfiles/file/futupabotafozip.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/mumoxetejosu.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/mofikuvobogevokubaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=simultaneous+linear+equations+questions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc5c.bin
19fe4cb281fdbcca3799d1bd7bf96866f34849f3caa8b6e378b29b680594bf2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 16872 bytes
font_01_sfnt_off0001286c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 16792 bytes
font_02_sfnt_off00014083.bin
ad4a4f525e88c88c34d35f8def1f313e137b962e30ff4bc54002fb4b3eeca886
pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 10588 bytes