Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b55d669bdead4c…

MALICIOUS

PDF

85.2 KB Created: 2021-07-16 11:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f27a8cb37a6e9655720f7217b4d11764 SHA-1: c7bcbf4d750c444bcf747892a83ce3212d197f6f SHA-256: c0b55d669bdead4cc105cffab277c8639388965d8bc04897a8b43016d74bb4f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings are sufficient to determine its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cometsecurity.in/admin/userfiles/file/nuwumupazufogeb.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8fa12451---79990503740.pdf
    • http://uctodane.cz/UserFiles/File/sumuvasukirow.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6f6aa1cd806e92284f1a0b4fd5fea14a/28096741701.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/pudabebemidezu.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f2e9e17f---96960056150.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/39827268316.pdf
    • http://www.annaleehuber.com/content_files/file/171941450.pdf
    • http://hanasushichoice.com/uploads/files/6727564429.pdf
    • http://85560891.com/upfolder/e/files/20210702162907.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cebc7d1a9a9c1a35f3aa6a25f82c669e/zigafojawutupixaza.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/611f6b8efe7320bc6c644803a637ec7d/7278318866.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2556d92547629a96377a790bd9e89f30/46057042714.pdf
    • http://alexhofford.com/temp/files/file/60296227808.pdf
    • http://portalinmobiliario24.com/uploades/fckeditorfile/bigapavaxodilod.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0e958820---39268725133.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5nnb0gn133keiebfiremorvg0l/81138437667.pdf
    • https://observatoire-omic.org/documents/file/namagel.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b35784a9888---kujekiwokikilevob.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9640799e6---89376484911.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3elrip9rfvoa6ddekocic2ose3/jarerobimapukuki.pdf
    • https://techson-cctv.com/upload/file/dakixagapamipulinegewati.pdf
    • http://beloezoloto.ru/userfiles/file/14968099436.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=assay+definition+pharmaceutical+analysis
    • 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_off0000e861.bin
167c62ca96bef1948a52984f82362afde61eac5921e64d160ea63db9e37a4636
pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 16868 bytes
font_01_sfnt_off00011438.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 16792 bytes
font_02_sfnt_off00012c4f.bin
59ae92f20ed6a1b5429c79452b3dfbac01c739f9c3eec82c77bbac7765c8145b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 11080 bytes