Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bbd1927116f484…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 01:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 65ae53a8beb1a20560fe2292e1840b1f SHA-1: 1e0dca8adb17721ee2f2fa7d2af3ac00bd32dc51 SHA-256: e7bbd1927116f484f53ccbca4b4684d2ae2b969d251d4aaabe8b44859a7e3b13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=blood+omen+ps1+rom PDF link annotation
    • http://saiprogetti.net/userfiles/files/30172614431.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614baf80d0944---kasojovekujinunuwafa.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/raxomi.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/14420498034.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161460eb2ceff4---xenawijojufexemuzipozuk.pdfIn PDF document text
    • https://timminsrenovations.ca/file/ZD8Me2FOc62mTxl3.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/77637327660.pdfIn PDF document text
    • http://halanmilk.com/upload/files/kilowexopuwujevo.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/95312227954.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/1118607510.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/diburoxozisegubori.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/niwibemipokepipumok.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/57573128866.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/jomokisuvu.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/34591437315.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jutubelunixejamopexu.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/12536652032.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/76471382226.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/sanukikubev.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/29182602049.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/68511717427.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/74400818219.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd6cb2fe6c---74469657653.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/71287646536.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/teduwibe.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://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_off0000b079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 15688 bytes
SHA-256: 0a0b33e8d86d2e764cda4a0103fdad2b4cac31a1d2346ba9475a1bfbbdf8e576
font_02_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 10304 bytes
SHA-256: d0037cf8a68b6e41289ab38c6b185f90b1b894acec7bb0a7a352e67da5a8fe6e

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