Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0ab892c4bb6f1b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 01:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7315afba171190b790b50f6e99b1846f SHA-1: cc5d34672a43612d0b00a8eacddd2fde88e9dd35 SHA-256: bb0ab892c4bb6f1be33245da10380171cdae4d23fcaebf3c231f752babce1266
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://invest.pl/userfiles/file/21946106147.pdf In PDF document text
    • https://bostaninsaat.com/image/files/64899469777.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/hh4dcsd1o0bfq2a6lsbfg7j71a/62898865263.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/77879333082.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/panevenonaxusekuk.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/boxofi.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/c2b594d2e3b3cc8a8e299430e79f4e0e/44489499520.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ii1b39ka8nrrad9pd4bof4b2ub/82818142445.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607824ab831d9---23708226827.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/94644408175.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/50418875565.pdfIn PDF document text
    • http://khonggiansangtao.com/platformecom/img/upload/file/xowezisasoxopag.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/fodazovi.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/12975549296.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/negewuzumipuze.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/mumewulomekirovimujamup.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/1949922284.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jrnosj0f25d9hnme4ntpu7h0r6/98311758894.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/vemuzafixenefisusuve.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b89e9aad8---83649863113.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c579cbb40---85433702119.pdfIn PDF document text
    • https://vitanov.rs//files/xewunuramid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=time+zone+worksheet+6th+gradePDF 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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 11016 bytes
SHA-256: a52cb19f310e2529fe0b4d57e01418759e4403e6e2c1c62978b736f6b2794b28
font_02_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 17016 bytes
SHA-256: 6055bb5c903e0ef6341f5da41f320b319e064dc88520d9de8c14ecb2ee141ea7

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