Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9ccfe7c3e87eff…

MALICIOUS

PDF

86.8 KB Created: 2021-07-24 19:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75f60f370ce2e3a844488fc5ed55928f SHA-1: 2256e500e55cca653059da53882a421d06c713a5 SHA-256: 7a9ccfe7c3e87effd421faf2f648efdf515a50669b57f112e82b1c1bb1aa7260
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, which likely serve as a distribution point for further malicious content or phishing attempts. The document body is unreadable, but the presence of numerous external links and the high heuristic scores indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaac0454be---82047208145.pdf In PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4a73863e76d64fa1a141b4b427378d59/9710155842.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9b55ce2231547aa746f7b1cb6b5d629c/pativadamatok.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/du85beqvaioadq55mkk22qpv26/semegesirevub.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/76158715661.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/vewasumebofodebup.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/renakewini.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607606ae3debe---sasaloxogukizoza.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4e45d383---tunizevukama.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98902806d---bagajox.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781650dca4---pugalosukiv.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/pusavazufaxevi.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210623/2106230243256742567mordt0wfyln.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1468daa3be---siporo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a725d00672---wusopojazivedesuxiwupuzal.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2596c9ed---47951576929.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8e63b906---92949256874.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847172a562d---pisubek.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jejojafixopixarajo.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/4892210088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+remove+the+bowl+on+a+carburetorPDF 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_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 16480 bytes
SHA-256: be406a23c4704a33fb659c72e7de6c740585570af12020b4426f8efb763729a8
font_02_sfnt_off00013523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13523 10616 bytes
SHA-256: 745f513af3dd37a74b7b5512b66343b768bc0a994755d843077a8ab3cd06785a

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