Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19f68f6bdfe4c68…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 20:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b7c446f1233ea6ab2ea072317ca8eb8 SHA-1: 2c9f9cdaf8a5d0471973f9287ee188dd432aa80a SHA-256: b19f68f6bdfe4c6868beabe7475a8ee3252dce950ac398c605575753d73ebe15
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external malicious content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://mmeasar.com/mmeasarfiles/file/58913551730.pdf
    • http://labradory.pl/file/gamigazuvun.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9d8b7578d2cc723d8a9c4c884d5a2f6e/xomojakok.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143057abfb85---32672085921.pdf
    • http://miydz.com/mingyi/images/userfiles/file/pogumijebuv.pdf
    • https://distriparkbotlek.nl/userfiles/files/vakinoziwivugikuwuw.pdf
    • http://se-ty.com/uploads/userfiles/file/dozububasubafokapokizaf.pdf
    • https://helicopterleasingservices.com/userfiles/files/1086742185.pdf
    • https://simpangkanan.com/contents/files/12593566357.pdf
    • https://spyboarcams.com/files/14835542832.pdf
    • http://camelliafb.com/uploads/files/202109061450527582.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6969efbeb---wizabanukirubajikamotogo.pdf
    • http://www.heksan.com.pl/file/mililesobeputavuwavez.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/15017530046.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dotupazi.pdf
    • http://teedinmaesai.com/user_img/file/81637773335.pdf
    • http://audyt.rowerowaszkola.pl/imgturysta/files/xemisudemogizufikux.pdf
    • https://dichvuhappyhouse.com/upload/files/guzisebepozulirijasurebuw.pdf
    • http://feriaalainversa.com/uploaded/files/mokuzok.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427179f02cb---gujupaweduferuzawa.pdf
    • https://pisangmanis.com/contents/files/rojaledekeresenepivewumi.pdf
    • https://clinicscrm.com/img/files/77784672592.pdf
    • http://guidesdugrandlarge.fr/images/import/file/34898044409.pdf
    • http://88cpap.com/userfiles/files/jodasesogokitekij.pdf
    • https://alariel.be/userfiles/file/mesuv.pdf
    • http://mikomisushiwc.com/uploads/files/84223835846.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/nebafilatixivetipolovuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=migliore+tastiera+android+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de84.bin
e61352e97d9299766d9e82f26f221703fc31699077911a7621cf52b895d68ca1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 17884 bytes
font_01_sfnt_off00010d66.bin
1363c5166bd399088d30be9aab2289e24d1dd388c1e3738b5abd10b33309c69b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 10416 bytes
font_02_sfnt_off000124e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 16792 bytes
font_03_sfnt_off00013cf2.bin
09cd6691fbbb1627d0dfc7da6220768119224cc7e55eca7214a61afd6cffd665
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF2 2032 bytes