Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7dd90e4f89670e…

MALICIOUS

PDF

93.8 KB Created: 2021-07-02 03:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b76618cc5644a6550b12012bfdb86d56 SHA-1: dd9c1ea96ab16b0b09f22ce2548ec967fcdb4041 SHA-256: af7dd90e4f89670e25c89bf57c06aa1749ed261345d465696cc180f6a8669be3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is a common tactic for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://itineraire-consulting.com/ckfinder/userfiles/files/nekadek.pdf
    • http://bpsstudio.hu/uploads/bukaxizawul.pdf
    • http://moriefrusca.com/userfiles/files/defimevepamape.pdf
    • https://fullgame.hu/uploads/files/vobewikifovugarik.pdf
    • http://crosswaysrecruitment.com/userfiles/file/12777959439.pdf
    • http://schokobrunnen.com/idata/wikefive.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc516b95f5---xitunezax.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc0edb79c7---jikozofinujisowesumojapi.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ctgccjhqsh4en4l1g0hnavn5ev/gakirixulo.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070733b595e8---26055721933.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c162ddf388b---senuputufepupuvesoti.pdf
    • http://michellesmithscott.com/clients/36670/File/36209156440.pdf
    • http://alliance-ltd.com/userfiles/kobivibuzatin.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085f32bad4dd---34825062429.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e029ab0c9d---87289746878.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/tudasovozajifivogosuvafe.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5c6161bbe368af1a8f3afffadb268a86/181033480.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/777k2qanvh1kani4sf3dl43i6s/41254731383.pdf
    • http://mytmbc.org/fckimage/file/26644261512.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b655972d740---vuzizovatavenixako.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/63188112672.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc6ea7816---jojefiv.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc7a665e3---42779105742.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ea824adb4a3317e5e58bf209e3054cff/jidasizarumabok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+prepare+for+verbal+ability+and+reading+comprehension+for+cat+pdf+download
    • 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_off0001091d.bin
952b8299e8dfd23cc86169baed786a529062947412ac434a0b6b9014c1bf593e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 11464 bytes
font_01_sfnt_off0001239a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 16792 bytes
font_02_sfnt_off00013bac.bin
ee1077ebaf9e4d850d03b0a54b14477163ce43bc9a69681de06c71339db9b794
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 17348 bytes