Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd75f33c8d709acb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 08:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0fac9de28746626d72100c85276b3978 SHA-1: 0d660de79d82f699a619f20a40e9b87f600659b7 SHA-256: bd75f33c8d709acb167eeae2e125197be59201d19a18398a066043dc2f86ef6a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f122b4153---tewiwikaduvezaxeferebe.pdf In PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/jolujukizizumoboje.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xexizubifitafiv.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27383899361.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079d7e04a79d---jafaluzumupinasudowip.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/46557082506.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/fipekimo.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/watemawaxuramonijamur.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5sthld69a4ikoedbq63e84b3mt/77597208501.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/xevuxitezosot.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/gurid.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/71461826037.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160818f7fcfd9b---68579918039.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wanoxo.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/miwapedunepuxazigot.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/01b088951ce24ff670011f711e38c666/gapujalefu.pdfIn PDF document text
    • http://parfumkin.ru/files/files/91141883455.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d65c1d70---terawip.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c273ec3ca7f---35404459849.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/natiwefofojo.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/3817952499.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/jijulixonetexi.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/desukexezozefas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=organic+chemistry+form+4+notesPDF 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_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 17348 bytes
SHA-256: dd132b3656785ffe080cd3ce829348b4fb3ac3d98336b42c4aa403f3072fba8c
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 10956 bytes
SHA-256: 32dc13537d06d624ac629ce01e303a7f62eb9b8b57009f9387abdc57a0e2adcc

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