Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3f4fae008e31d9…

MALICIOUS

PDF

91.6 KB Created: 2021-07-29 23:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8c845e214b9a6f6a796c5a6a3b02293 SHA-1: cbc0095e9bb792152b63950678b1990a93936f6e SHA-256: 7b3f4fae008e31d942db80a4d3492b68b55d1683862524226c4215c05ba860aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware. The presence of external URI indicators and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://chcial.ru/uplcv?utm_term=escuela+sab%C3%A1tica+cuarto+trimestre+2020+pdf PDF link annotation
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/muxemaxerisorabowaf.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/dikuwidakopelobefaba.pdfIn PDF document text
    • http://mextro.de/upload/files/62910827746.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28800eba6---bobanusotaj.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/57477722645.pdfIn PDF document text
    • http://mutitar.com/user_img/files/85168051843.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e41895a690766f869cb14a7ca25cde05/lizitatejakikewe.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f6eb20c067d884e78c2c1c7b64610b40/rewuzofat.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e436196a3---fasafuk.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/sezejelelazetenudek.pdfIn PDF document text
    • http://calisnt.com/uploads/files/11348071822.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad5c04374fd1e9f14a2d324381c38fcd/27443443492.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/38446399918.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160deba435969e---vuzajutabujerosa.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/67584137059.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/42712302920.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/vizix.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb126b308b7---88734261063.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/85980408521.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/p8glfnbfgpktm6j70g228r49g7/79985611577.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/babccd264d1b718ff6446f989a905ed2/guzujapemun.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/68874048656.pdfIn PDF document text
    • http://bjallstar.com/upload/file/zebezewurin.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0aae600539f1dda9b599112f9c272571/vulokusuzexisev.pdfIn PDF document text
    • https://norservis.com/files/files/47469277915.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 19652 bytes
SHA-256: 89781d8143de8b4deaed970c078b2b1c077232f6d11fe8bce620578136122f03
font_01_sfnt_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 11320 bytes
SHA-256: fbc98c0791a83f0febc81fa4b414c36019d297b65dd859eb50526338cf6189eb
font_02_sfnt_off00012fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000147f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F6 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7

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