Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b6db0a510cd5bf…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 11:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42411b2b2e8dad2673e658a24ee99249 SHA-1: d82ecd832df7854fcd9175ae2cd1f8bb44cb93d5 SHA-256: d4b6db0a510cd5bf0f9e1c706b993ea1a31edd055bcb4321ee6f9ce873259ec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.knickmeier.net/images/pageimg/file/37365582367.pdf In PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/1d2nt753vkig9as711gch1ddorfb564j/suwofunizovemovirijagixi.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/2937727802.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/97289c4ddf5b08e7c22ad9c6e8de6a7f/39931091644.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/refete.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075062e141b8---zuxuvawazefebesiwowe.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/40771918496.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/14872470670.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/79976595534.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pg7cgab4b15tbolakjk16gdpta/bewijet.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/28433061366.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/kitudasudivepus.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/fixugawototemavirajadukeb.pdfIn PDF document text
    • http://dgjst.com/upfile/file/pixorobamadup.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/zonumigawatenavumodokokil.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/45794362046.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611db259d3773---32607013278.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/gebufegag.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/xolegezutexenotunemab.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/62edeb779ee643fa74a82a833ef7ecef/zeritavon.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1e3a594c---9338355068.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/96570417303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=asvab+book+free+download+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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10664 bytes
SHA-256: 16cd51daf10888f8f23a5258556a0237cb6718abb0875cd54857e5387c8c421c
font_02_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 18368 bytes
SHA-256: 1401e6cb89d788b3c3909a072adcfd8c45bec63616906a270f95d374da316075