Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8418c4fc2f1c26e…

MALICIOUS

PDF

89.3 KB Created: 2021-08-14 17:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33802afefe2c3b7b77e246c75fa9a1e9 SHA-1: b1af5747a3bbab7a924146c8911f0eaeb2e64106 SHA-256: c8418c4fc2f1c26e3a7e5cfbeb5e92415b79f56866f33c13dbd8c0ef642075fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which appear to be disposable or compromised, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dilimkebab.com/userfiles/file/xebowopelesolonegusa.pdf In PDF document text
    • http://studioingtassinari.eu/userfiles/files/84741807228.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108a4e990af4---27810146213.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/tobekoxifinidu.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/zozokoperajilo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcdd283b9---wiselibujotoba.pdfIn PDF document text
    • https://termoformat.md/img/files/22725129642.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/konek.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/57912961327.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b8d3f291---54600848821.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608095687e89f---4303142057.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee492de16c7---95401717449.pdfIn PDF document text
    • http://beta-rc.com/upload/files/kipaveto.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bf61625b19faf0ff9981a7b0198fe23b/jadugidebanilekojasibo.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/98122039000.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17563205f---dadosex.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/59956598389.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/maxizexu.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/78488299895.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/rajuwa.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854f0923507---87060774923.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/tuvoxumotadujugo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mickfmla66r2rl0j4amcicaej1/86780226013.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/911d18dd464c26c2d5127845e25fb7aa/92540923369.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57558c6d4---fasepiroresewemeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=batman+arkham+knight+waynetech+points+cheat+ps4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 17664 bytes
SHA-256: 1b2c1e044572b173aab90fb1b85115f46f542cb22187b7531ba11258992b943e
font_01_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 11200 bytes
SHA-256: 59ce092fee6295fb578959bc8a91dfff8c7453714ee48a081aeab240eebffffa
font_02_sfnt_off00013f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1