Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd56ab4316ec60ac…

MALICIOUS

PDF

89.0 KB Created: 2021-09-03 18:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de7bf4147b1f209fe23dc9ac0a0f1c07 SHA-1: a021a87b65c9b1c77b3ad01811a9a1a8715e57a8 SHA-256: cd56ab4316ec60ace839250421cfb9e16aae91d2a70982bbfc307b54f69a74d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ed-web.cz/userfilesfile/wiloxulopu.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738af53351---betusobibasaxejim.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/67680310019.pdfIn PDF document text
    • https://digireg.si/upload/puzodiveratirag.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1842529b8b---womokikotibis.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/bezewaga.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/2764665955.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/16232156843.pdfIn PDF document text
    • http://cochu.net/resimler/files/jirurasub.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xulol.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088459703327---nanadupusagovovanafukavo.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/59111202148.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3laekfs2vhfv9ueidmv6l96ua5/21145752060.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/ditopivonogosifu.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/mapananop.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/suwutojibilunevetijazis.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/zatuperawipetiva.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/dixamote.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/qqrl1g82gcq3lqj99qpisfc48r/86586017882.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8m3oh373kqbof889i786kdvne0/19128569014.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba78806b9f6---siwelulutokegezepot.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac78b31ff3---86914627758.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161055f92e575a---98859027857.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kejewonimukatonitisarulis.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/tujudebixapexojub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=panela+de+press%C3%A3o+eletrica+midea+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 20600 bytes
SHA-256: 97c2473fe31b0f75d929e0cfcdd272b33848b19dabe0ef05ea966675afcb577c
font_01_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 11044 bytes
SHA-256: b381c1bac99efe156f857ed37e819c1328c0992380b0f4d0f9435017990e994c
font_02_sfnt_off00013c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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