Malicious PDF — malware analysis report

Static analysis result for SHA-256 85664a365c09eb88…

MALICIOUS

PDF

92.3 KB Created: 2021-09-04 23:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c45e1b9b61a3b74f4304cb0183eb2d62 SHA-1: d929bfdfabd10333399bd4de39a69bc01413d611 SHA-256: 85664a365c09eb881bcc76c16e50192c302de1f6f3a1f9c3fc9c3b4c3ac422d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=la+d%C3%A9perdition+scolaire+au+maroc+pdf PDF link annotation
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ec087860f---49912667608.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/61247601445.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/hus8bbpudn7dd844hsd7g94p4a/81297074562.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/vuvubovovana.pdfIn PDF document text
    • https://olterus.info/contents/files/nitofotirusisazovugiseden.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070409560428.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/oibc516iungter7qsgbe4h1srf/46270012701.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff5d7d75c---2338351533.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kunedaropifibapus.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/73269684672.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ddb3a6dbb---bafazato.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/gipuwigakebulanebotinoda.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/xatusalusi.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xojijafo.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/direw.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8412b1dc---51396397154.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613084f194082---52430734023.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160968bca13175---54869219527.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/9327126320.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/votelovoxetejinuperilo.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202108182106581889.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/22092846659.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ac5d227a33256d4d29be0c717f276c5a/vemitigufub.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_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 20752 bytes
SHA-256: f98625dac7bcdc77b4dada982eee145648fb0be28a73f1526243a32deb825a66
font_02_sfnt_off00014884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14884 10992 bytes
SHA-256: d62dac851477dbde51a5c26d00c0b2bb1a665012774017a71a47220d6ae8acdf