Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f32c1c0420fb04d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 02:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6806c0f45d1d9d149cb3b331d74139c SHA-1: 26c3ec1d0ff12b027afb413178b35391344fd35e SHA-256: 7f32c1c0420fb04d4b88cabd187745d3a7d4ae20d4cbd9ae1d911a68bcb02798
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to leverage search engine optimization for malicious purposes. No scripts were extracted, but the overall structure points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=answer+for+proposal PDF link annotation
    • http://www.advokat.com/app/webroot/img/fck/file/39144109657.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d22a68509---mosixofunafutepigadufixa.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/gozonegepulonavosales.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210821_53BD73CA083EE88B.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/fenumetusizuvorelok.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100e3822a910---pawuduzefitela.pdfIn PDF document text
    • https://aashianarealty.com/file/36846506051.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/82861034035.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/988c0cc2fed67592990024e52cd0376a/kezidisotuzikoxomem.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/reviregilajezab.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610acc641c70c---molujim.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/66942376771.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/58820901517.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/moxizosekiterimibu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee45715a0d5---bezasebijax.pdfIn PDF document text
    • http://teplospectr.ru/images/files/4401217118.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/buxovixoniligilujarowitej.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/rebabijedesofuwux.pdfIn PDF document text
    • http://teledirk.com/d/files/lirepewi.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/0f65e4f87cfba2406e257c1f6bedcb1b/sokijesagewesusiji.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/dunobaxako.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/59527767531.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d3ea7db052157c4fbfa85de0c32010ae/53247903447.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/14535955853.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a058005d2---niwokejadivigivejijub.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_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 10228 bytes
SHA-256: 41e8bd17d9600f0119afbfb52379137f05ce1b2b76cc1007150dcbba1a0d82eb
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 17224 bytes
SHA-256: d0e55a3101b92a114836c194428279ce5ce34585cbfe8d88354b20e283c5cfc9

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