Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e5af72193ed3b0…

MALICIOUS

PDF

100.0 KB Created: 2021-08-16 10:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4e2945eaf1ab66ca1f94007b14ae049 SHA-1: aecba0d2a2370920a172dc8e96b7b0de9118480d SHA-256: f3e5af72193ed3b0a074818b1c9b34234c0ea25f516a4cb792ca7917818767ca
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable due to encoding issues, but the presence of multiple suspicious URLs and heuristic firings is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=final+fantasy+x+expert+sphere+grid+guide
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3e6ee7e87287d256d92107f539eeeef0/rezeladujopiro.pdf
    • https://alternativecarrepair.com/userfiles/file/12895782977.pdf
    • http://thebrownbag.vn/upload/files/48786124094.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b545dc641534134286294725a32d8846/guziwoxusipizekilutodi.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/h5mf1vgncg5asj1u4te24f04k4/31242284492.pdf
    • http://carszana.com/image/upload/File/25603302412.pdf
    • http://meijialx.com/ckfinder/userfiles/files/tegipabuwibitulesegal.pdf
    • http://np-laser.com/upload_fck/file/2021-6-17/20210617210522605442.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9aea902296e179bd69afdda2f2f5a29c/36336120112.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/pvtqomabas2l3h5nfh05k6t6jg/xebiwusobudix.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160700a735c337---84108586747.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f58ab9b49---29865871032.pdf
    • https://verandapattaya.com/userfiles/files/zaduw.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4f79e00d---totifodi.pdf
    • http://nguoigiupviec99.com/webroot/img/files/xerefebokig.pdf
    • https://alamansyria.com/userfiles/file/13817145908.pdf
    • http://cascad-trans.ru/files/suvigajenuzetojowefevima.pdf
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/83561610500.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b85fa939145---teronekasofesowozufojil.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/25559251312.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76c16e841---89697300801.pdf
    • http://dfh-consulting.com/userfiles/file/17169917133.pdf
    • http://zabradli-znerezu.cz/userfiles/file/gozinezivifozizuwobuwovan.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe50b48cf07---lipozopalumuzisemokij.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kagawifax.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_off00011d37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 16792 bytes
font_01_sfnt_off0001354e.bin
934acaa5b741b970875d4069bfb9c97e2b6212e0f82c12458d701efb5766102f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354E 10948 bytes
font_02_sfnt_off00014e67.bin
74aa7f535bda51f615c0f5a1bccddc0805dd4ff3f7c5b3e21d5621104564ebd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E67 19240 bytes