Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0579f12a2cffb3f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-09 09:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2503aaad52b329ef6e9fe9652647866 SHA-1: b042426eb65ab05ec1439f6c8dc947a4ec22a871 SHA-256: d0579f12a2cffb3f023a58b977be086a5285d90db5ad002d73c9df6de5cdfb09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=the+conjuring+2+full+movie+123movies
    • http://chatfieldfarms101.com/userimages/68445448963.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/18457941988.pdf
    • https://anjingliar2.com/contents/files/raminerojolamolejanuz.pdf
    • http://www.bluewhaleline.com/image/upload/File/dixus.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/o0bousu7kijr2ii71d37eogsl6/64089529439.pdf
    • http://hysansam.com/fckeditor/userfiles/image/67669204959.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161334131b3cc0---sukebukozefiweginazo.pdf
    • http://barudan.hk/UploadFile/file/20210904121212097.pdf
    • https://elminhaj.org/userfiles/file/57632622349.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/tuvasej.pdf
    • http://cuatro-pr.org/sites/default/files/file/95151402849.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/toxomaruzaxelide.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366cc81ec1d---lamigekolere.pdf
    • http://nomorecpapmachine.com/userfiles/files/59045068771.pdf
    • http://urdu-hadith.com/survey/userfiles/files/18658203878.pdf
    • https://lekkermooi.nl/userfiles/file/67927783626.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139301d0c7bc---55138638527.pdf
    • http://www.serge-valentin.net/ckfinder/userfiles/files/resogamakiloburagire.pdf
    • http://abwhopewell.com/uploads/files/59499210590.pdf
    • http://malir-naterac.info/UserFiles/File/vugiwewebibebebidafo.pdf
    • http://biirbeh.mn/images/content/file/35032670000.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13171080811.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8d473c2e---kabogupamupobojer.pdf
    • 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_off0000b6db.bin
8f64ece66e6e50c8258f036b5464fdc60a56d725f113c6950bcda6a826099c11
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DB 16132 bytes
font_01_sfnt_off0000e036.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 16792 bytes
font_02_sfnt_off0000f84d.bin
c0b87354e4c4c87078e62b9eebb10906418344e32ab05a1d31067fc8a3433933
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 11124 bytes