Malicious PDF — malware analysis report

Static analysis result for SHA-256 df35258ca29b4ffd…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 19:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2c3a85ec1c5b4621be9bc07147c9e48 SHA-1: 0c1904526ede7a565f930dec7b114202532d22ec SHA-256: df35258ca29b4ffd6392f707bb28e78570de8836d337baa5ab25de223925ed0f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5cf43a83efb4899aa044871e1dc11708/kusanotawivalifoluso.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c8965696116e5eb12048839f3e3b66c8/12054497140.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d495472299e5d4b4b3828396c90c994a/58385471447.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4da2ed809c---fazagezutomabimolamodejo.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/lgrmnbl6c0ah98iqd9htfs532p/mejidotegagem.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/19638106841.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738572d04a0---86967979021.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ceca98ff82b42347d68a35ac8f1b8cac/tulip.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210815_04B724F62BF5C228.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/7bvnh9b1ddnl48fe68tmdkgkis/pimasiromarunilaxa.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/18706667900.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/69852398392.pdfIn PDF document text
    • http://moristas.com/userfiles/files/38215201544.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/ponikilirexinag.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/puwifimokef.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/sajunidopenulidebunuvaf.pdfIn PDF document text
    • https://panama4d.com/contents//files/pipetugozim.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/wogupevavuvosobufejuninaf.pdfIn PDF document text
    • http://utopbrake.com/uploadfile/files/6390974493.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/rifakumanogebalugufomos.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/tefawizuxawurivejexu.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/notafe.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/43883931896.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4991953cf8d9602ae467a04e8b3701ce/zufadetotodixepakefibo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/korolulodexaxagigomewaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=uncountable+words+pdfPDF 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_off0000b793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB793 15812 bytes
SHA-256: 610d7a69b7e69918516974c85ee0e2ec5a548602b39eb7ce83cd96060d0768de
font_01_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10856 bytes
SHA-256: 68b46c5f7b9477a278a904ef927c949e1bd9962e58c9ba086290c02e121dbe4c
font_02_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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