Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a64add586c69c05…

MALICIOUS

PDF

90.6 KB Created: 2021-06-27 22:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d3e6d944c5ecca1baf5ad6f12d989a9 SHA-1: afe8b1a5aaa8d433fbd6878de852cb1146e3f6b0 SHA-256: 6a64add586c69c052a7caee64be72b45179e24ed1c42ffb1c9b237c0521bcdc1
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 sites, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URLs are sufficient to determine the attack pattern.

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://pk-kuepfer.ch/ckfinder/userfiles/files/89261267747.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ebe45d316---61249009452.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072214999fb7---6063038823.pdf
    • http://eclickapps.in/userfiles/files/xipawa.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fbe88a85---maxibumuziluzirogoliv.pdf
    • https://bititechnika.com/uploads/file/44263853452.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/69aab797129f13cc0def054ce5366981/jiwirunoganunuvisegoje.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/2bd1d6934f77d2fad85492d93f1c6416/43882898697.pdf
    • https://o-dance.com/upload/files/zovaromebowurupovoworupez.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1e4fe7f68---gexipomevizilogibofazu.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/43fcc0be0fffd265f1e637fe9f297b47/vupuzijutararo.pdf
    • http://esejsc.com/upload/files/21526330036.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9170c4f854f680460d33a1b45946b588/73077114445.pdf
    • https://airflow-skateboards.com/upload/file/wedotakuxa.pdf
    • http://alkanboya.com/files/file///21737210917.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qc4msmihs1ruhlmomsdp5mmuvv/lolofobozatumud.pdf
    • http://c-six.it/userfiles/files/71663102708.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/aie7232afmqlh96cmc7dr7p6n7/97914615523.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b25b6b5cb23---41492213427.pdf
    • http://anatolianlgs.com/userfiles/file/35074503120.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c9335e81---88968154201.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3828b09e0---jajusowiko.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/r0sgase64ee917m5e7t5f9gcf4/nuzepobovukero.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+solutes
    • 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_off0000fdda.bin
de2e280461c7048ea0f58dd97a353bf465615adec39e1e6605d4e10ca8c631e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 18320 bytes
font_01_sfnt_off00012ea0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA0 16792 bytes
font_02_sfnt_off000146b7.bin
b70310e724da31378eaf7429779e0bae090ae7c6797aa981211cf0b74e74437f
pdf-font-stream PDF embedded font (sfnt) at offset 0x146B7 10072 bytes