Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d2da8fe4d7f418…

MALICIOUS

PDF

84.3 KB Created: 2021-08-09 09:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17b6f60a785106db3cd3e16f927b045d SHA-1: 727c9a7ac9988e53e83ad307d21fdf84e093bd1d SHA-256: 58d2da8fe4d7f41878330fa1df7eeaceb622451e75e4511cffb52b5bca3841e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to external sites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=how+to+adjust+water+temp+on+shower+valve
    • https://dunaweb.co/bg_image/files/xobivavibipapasidaluza.pdf
    • https://aksukartela.com/images_upload/files/bapibujetopipevex.pdf
    • http://vietdubai.com/userfiles/file/fojozubetorixipozosolufa.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/55901338881.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/63827433125.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/40763284b23a3ea5909e5e3b57e165a0/najod.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0a740d9f---wejoleboxopasodokab.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fd2bdcc374b4307144f4b47f754b97cf/baxevabefilopiwinif.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608735b03989e---tureronaj.pdf
    • http://kapsalonindex.nl/images/uploads/busefiluwimekikowoluroted.pdf
    • http://maciejabramowicz.pl/upload/files/file/95858073520.pdf
    • https://chaplains-camps.org/upload_picture/file/45581526620.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/vovopexafekovusekopa.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa437d8baf7---53216792511.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/s83csmn44sgp5c3513qr158bc5/37724827534.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c061df07e7---8284992888.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/pubemukimozoz.pdf
    • https://pmfegypt.com/userfiles/files/nonikim.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s2st1er7fl05jtm1ktumd75hfo/42230835898.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/gititowu.pdf
    • http://mgocsm.in/userfiles/file/xivaxanupanokejatuzek.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68a.bin
9f80e93258f2b37588fd6f00993ebfd1bff1fae5bf8b25f7d8475be1cc9a9658
pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 10936 bytes
font_01_sfnt_off0000ffc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 16792 bytes
font_02_sfnt_off000117d4.bin
ee28dce6150b0907e4dc53760764a055afadeb2687782249071502bced3d26ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 16624 bytes