Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13424f673cd98c8…

MALICIOUS

PDF

132.9 KB Created: 2021-09-08 18:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e0826991955347fd9dc3329e6bb6388 SHA-1: 1982508f249eb81a9388fa85696504b73f82d71a SHA-256: d13424f673cd98c8b4f7829bc899eff7df4fad57f494dda6b3de4c328de9c548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links pointing to compromised WordPress upload storage. While no scripts were explicitly extracted, the nature of the links suggests the document's primary purpose is to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://www.geya99.com/ckfinder/userfiles/files/14545615016.pdf In PDF document text
    • https://jss-moms.si/upload/File/28317739839.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/puwupetusa.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347100811f4---temobelelakidebizegaja.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/vamelo.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16308892679246.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4d8be091---fixajabaxurusuvijejoxagob.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210905214602_j0afcs.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/29197249323.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/53130926975.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/98147588806.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/lofota.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/xiwowu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1ab26933---42565187082.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/40168151274.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/2131049783.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131e27564c90---48679430325.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109042344243269.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/99961077784.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/30195236700.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/datimokofulelisagebu.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/busibunewebepumes.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/julitororos.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/jowaxav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=yamaha+mio+soul+i+125+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17295 10432 bytes
SHA-256: 021fb6e03a890f9d64ad4ac8626803157f4f34ddecf0ad6770cd87668dc7880e
font_01_sfnt_off00018a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A14 16480 bytes
SHA-256: e16fa176631f516262d4f7992fabfa361449274703f792e6a26ce8d9704c797e
font_02_sfnt_off0001a10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A10E 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_03_sfnt_off0001a9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001c1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1D7 27156 bytes
SHA-256: c9096cfb4a372a438bd0ecc7412e7adfbdb91b5c49352f7e1353bc8eed4451b3

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