Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b25e4576e0e93b8…

MALICIOUS

PDF

95.6 KB Created: 2021-06-29 17:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ceb5c5170029ccaa74476b1f9a28796 SHA-1: 87ccdea0749aee12ccc14d282a1e42964ecd513e SHA-256: 5b25e4576e0e93b82a94848cb11822299420852be2b2f870a507b9c8f5ea1790
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.bash.cl/media/file/tuxivulaxamaru.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a127a16feb---60272782550.pdf
    • https://advantagelic.com/singhania/downloads/file/20464083571.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/rovewojafodozasilix.pdf
    • http://tcihk.com/userfiles/89946403164.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607693ba030be---6102269124.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4b3a1fe38fc3ccf41e708bcabbe98a19/20227199626.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/78a72bf304ea5eca08ad3773645fa846/dowenowulewis.pdf
    • http://rustproofingottawa.com/userfiles/file/kagelaturojugagebova.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160860a4b000e0---nazezebulaba.pdf
    • http://magooferta.pl/uploads/fck/file/71125092504.pdf
    • http://fundacionecla.org/resources/original/file/66809778113.pdf
    • http://citadelcaralarms.com/userfiles/file/tozatutinuxugigese.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/72553e59f39dbf65db8e4313c79dc494/38426420477.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9l1n3kodpld1ns5fs6h33j3744/61448229772.pdf
    • http://alhouti.com/userfiles/file/kobudawidiru.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/2747d13e13692a31af272924c8552650/wedisanazowevetupeza.pdf
    • http://rszm88.com/upfolder/e/files/20210626105248.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mg2j1af9f7o07o5isq0d9c7vbh/toxusulofojofivabemivoge.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/pumugiragewak.pdf
    • http://braciszewska-klimek.pl/fck_files/file/75482297275.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/35602761820.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tored+meaning+in+malayalam
    • 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
stream_005_off0001560b.bin
141d5c1aba2a80a9e5e1636a7bdf8aa553eb9fe09b3476ff336968c23fbb6aed
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1560B 17476 bytes
font_00_sfnt_off0000f7f6.bin
e38745eb69272c1db72eb5a50e0166e4a8ea382bece45ea723b3d05aae8681d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 18300 bytes
font_01_sfnt_off000126b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
font_02_sfnt_off00013ed0.bin
42f9c5c2cb7c43d72e9f01d056642bd376d6f04d6fb26567e4fb22c07a0b3427
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 10404 bytes