Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d01bfb0a97a91d0…

MALICIOUS

PDF

80.4 KB Created: 2021-08-06 11:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa34418b40ab65d1a3f0ee5503cee9f6 SHA-1: d24bc6a682c0a3cb339b90b14be91a9fdbdb14ce SHA-256: 8d01bfb0a97a91d0ad7b7b2ced230462981ff1d585210fa9d6b34f7dcdec216d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress installations and disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=what+are+the+biographical+characteristics+in+organizational+behavior PDF link annotation
    • http://nhhs78.org/clients/63854/File/pawunixap.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b79f4a42c---bibun.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/c7h8fq22drfe3i9oi11p1aqldv/93845017245.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/15144468028.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/mirubepoxutuk.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2df46be03---ruximidusi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446d1ba91d---55406845665.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/su92l219ir5i9tkrdnnhi78dl8/17094472783.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/4752453276.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/wulefugebepawenogajuxipoj.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926de10ded8---sovafizin.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/761kms2qjeuh640aocq24s86c3/64324551680.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b7607e89---wasemixabi.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210730192951_1534867026.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f7bcc0309eadbd45cef01e821fe84581/17779979429.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/2954539668.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/94926922389.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/87011dbcdd54f7152c422f821d420be2/60580126411.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a117dae14---43327235944.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/gofajaki.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/muwodajoxowilig.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e1cc8d70---teradi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a69a90777e1---56333090594.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/medil.pdfIn PDF document text
    • 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://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_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 10912 bytes
SHA-256: ce6a171e12e385e7cfd4780d180a60b54c004cf3740438e956ed8991590073c2
font_02_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 18672 bytes
SHA-256: 31c47d0fa83cf69631a687840c71e8445bce545d146cb25d3a997459adc065cf

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