Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fec50173a3e154a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 23:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af7457e7235bc3865aa04ac441f44cba SHA-1: 33409a6470bde0702cc25dea1595a8822569c7ee SHA-256: 5fec50173a3e154ad807b3ca65aa718a5d5bc361c31981889ab232c0fe287dcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiomalpocher.it/userfiles/files/milisir.pdf
    • http://warehousetraining.ie/images/sekogupogetometiti.pdf
    • https://ctyhoanongangiang.com/userfiles/file/dijetaso.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75768ccf0---tuzafebulegoxavujok.pdf
    • https://agri-mal.pl/userfiles/file/nupalizenuto.pdf
    • http://hublihorse.com/uploads/userfiles/files/52632520593.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/koninexezapibatapomu.pdf
    • http://nb-magnet.com/upload/files/bizoniwejawibupazexavi.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138de57cf624---funinofijifizes.pdf
    • https://hzautomatisering.nl/userfiles/file/45369168169.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/dogapiwa.pdf
    • http://sbs-group.co/userfiles/files/87511797632.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ul36vsn2ctn2kjinmc62bnk0a9/japamavunagazukilozezi.pdf
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/64537274557.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/43373169154.pdf
    • http://dolonchem.com/upload/files/63486046094.pdf
    • http://m2m2design.com/userfiles/jamizetibovunimegelij.pdf
    • https://commonwealthsportsawards.com/userfiles/file/buvig.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135b67498a6d---jupoj.pdf
    • http://coeb.eu/userfiles/files/32584184092.pdf
    • http://studiotecnicoforace.eu/userfiles/files/wafedufisawofuroxibetaven.pdf
    • http://freetourscadiz.com/ckfinder/userfiles/files/41831325789.pdf
    • http://leebyunghun.kr/new/upload/board/files/wiwemomedigugunezepolasuk.pdf
    • http://geoplan.su/userfiles/file/39765751977.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+tower+of+nero+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_off0000d9ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 16792 bytes
font_01_sfnt_off0000f1d1.bin
26595f7f5bcb8ada335c0fa194cf868e83f85ca94be4617107be9c5121028b45
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 10176 bytes
font_02_sfnt_off00010890.bin
1c41c4d406d9f49f8b1e0b1d7df76a5be9a85c014688d1f469829b9b70374a6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 17024 bytes