Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe591c081690fbf0…

MALICIOUS

PDF

103.6 KB Created: 2021-08-10 21:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0706925e81716a2caf5bd8c4d825ee5 SHA-1: d184c0b31d03a732373c1317a90ba7dd4ac10e9a SHA-256: fe591c081690fbf03e73b1b7cde2c438b07039a0ed84a81830150d755da25ec6
196 Risk Score

Malware Insights

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

This PDF is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The presence of embedded URLs and the nature of the link farm suggest an attempt to deliver a secondary payload, possibly via a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083333f28e7a---poberotej.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/79681e5eb8c35aaa23e462680bc18da6/66405894005.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/16564979313.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/xevukifasowudike.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db108d3420---dexemewuzujefetefedipopu.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/c83d38952ad7e123bb2f24313232ac00/46819883343.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4875a39ec3---dilinodigofutusikunozin.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/zapekebeji.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/rinitijaxavaxatagoj.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b112cfcf473---xemizunapexegunokuj.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210604162284014724.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/xitotizijuxakasobavawu.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/subisip.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd78fd4605---96349320564.pdfIn PDF document text
    • http://demkapi.com/resimler/files/25204657434.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/221ac19bb9a00ddd1f931671b7eb3ac5/josiradavodelofew.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/mejovisokifubowutot.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/pajadaguv.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a032dc95ce377db368d0db4c79d3debd/vobaletawedoruroxiguxik.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c46bfeb541b---80191627686.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/vijujanizuxokazutopise.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430ea16d47---zutarilorepagasoriluta.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/80323434209.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d22c5e2385cc186e6d83e74cf890aa6a/85380586802.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6692dfaa4e202f075cbbc3b768cb1c2a/36078081658.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/wunotulivaxufetasiluleg.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/23677013225.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/57804216498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cisco+vpn+client+windows+10+64+bit+download+chipPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 11256 bytes
SHA-256: 18c79d73d29862104d0a217c75ffd75c9503f6f88e7435fd4ffe0ba00a09c9e3
font_01_sfnt_off000147f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16008 17648 bytes
SHA-256: 0c016f0a9011d7d7fbf37f476669384025de29432d501ccd34035c83bf5e9ae0

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