Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecc22da0063ffeb…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 05:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c8c2b0508e109580f4cb42ff5c67d65 SHA-1: 6d78f70bfb30a94f97e26b7bd851f2ddf2c8dfbc SHA-256: 9ecc22da0063ffeb4fc862eb1f4e8c9258b0c87ec0119a4345686e7a9b9aa688
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=how+do+i+know+if+an+android+user+blocked+me PDF link annotation
    • http://thesecurityguardunion.ca/userfiles/files/ledufizo.pdfIn PDF document text
    • http://getdol.com/page_data/file/xomuvitodegolugi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/75b31901ef0d610416be698897033139/xusonasarilanuwalakapob.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/decf6b86b4d4edd590c9bb21e6fd871a/pulunekafuviporemofudif.pdfIn PDF document text
    • http://tiquital.com/documentos/file/90132787374.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/2656704183.pdfIn PDF document text
    • https://sergiomauri.com/images/file/zibijazo.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/ponasim.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/teviwale.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/99976282054.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/84094137628.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/gebanadoga.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134656cadd32---muletosomugu.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/femasa.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109021256291366.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/golisalogusijutukevek.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/xefitasup.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/xudepudisotebogivojuner.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/xiwexamumuxinulereludo.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/99227460247.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/bujovonelufufefinepev.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/49055383595.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/wuninikedejajopewabigu.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_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 10948 bytes
SHA-256: f054c8b2fbb626bd239364d69fa22526cd0a27f5d510b8f3446a413627d23263
font_01_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 17188 bytes
SHA-256: 63664556706cec5b53d6f655acb683e5dd2439ddca3e3f82a871a9196976e2dd

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