Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba356f4279a3cef…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 23:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4489edfa6f4fe870da3e1bf8feeebd9 SHA-1: 096fb287dbc4e425b75ed422cb3d2f9ff3696262 SHA-256: 9ba356f4279a3cef6eb2d4bcbf321587a5f98421d6633c724dce7a1f4e67db83
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 WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of multiple external URIs and link farm heuristics confirms the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=another+word+for+more+starting+with+p
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/51906415445.pdf
    • http://littlepearlspublishing.in/data/eimages/file/2803341096.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614832e950702---77957175849.pdf
    • http://canadianrockies.info/files/file/50867211272.pdf
    • http://mapect.com/upload/fckeditor/file/25642137047.pdf
    • http://fsoa.cn/userfiles/file/pebetepofibasovej.pdf
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/57581893189.pdf
    • https://tidaksusah.com/contents/files/13313449587.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/wixozopek.pdf
    • https://perfecthospital.net/FCKeditor/file/83754737750.pdf
    • https://sushixusa.com/userfiles/files/titaseridivebosod.pdf
    • https://tiguan-wiki.ru/file/48703685721.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161358fa8b3f72---xokirufebopix.pdf
    • http://radis-rrl.ru/userfiles/image/safejonosonezipoxebapa.pdf
    • https://doina.md/fckeditorfiles/file/welatotibukunotikome.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f972aed839---61894417817.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b9f77fbf2---94007643225.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161314f88c372f---6580766955.pdf
    • https://usgcambodia.com/userfiles/file/7148459105.pdf
    • https://dichvuhappyhouse.com/upload/files/lakakugusuzatim.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/32993529223.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad8cfe3d92---24018212578.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_off0000b137.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB137 16792 bytes
font_01_sfnt_off0000c94e.bin
b31edd73c030e80190e85c622ecc93a2111b13d49a39dd95d8c7efb44a92b85d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 10968 bytes
font_02_sfnt_off0000e277.bin
1d87d6e7fcd2bfbe8ce42c8192bfdeb8e4b6f149fb747d730392529af1083cee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 15180 bytes