Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a11eaf3e79694d…

MALICIOUS

PDF

92.3 KB Created: 2021-08-12 05:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd859ce8f7f814177f02a75fc315b615 SHA-1: a6ce2ef766f7da7c40aaed0bde69c99996b8bf0c SHA-256: 41a11eaf3e79694dc22daccf9884810c9b0abe7a2d964378958d3a7b92bcf0d6
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, many of which are hosted on WordPress installations using the 'formcraft' plugin, suggesting a link farm or redirection strategy. The PDF's structure and embedded links indicate an attempt to direct users to malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16112d10d36272---20171148516.pdf In PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210702152846.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/sarigipulegug.pdfIn PDF document text
    • http://gibisch.biz/files/files/lejaxanuxekisosazar.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d032107556---6443051695.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3be07231---matenavufeb.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab9b07fe8b---17251001218.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c973ea82e---lenojesexixi.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/lifiborez.pdfIn PDF document text
    • http://iccarrentals.com/files/file/67761240303.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/mezaxumozarulijefedadu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ed2aaff6---zanebufamaw.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k69fuvs565r9denim9eleulcff/lufupawivojefi.pdfIn PDF document text
    • http://susanjeske.com/clients/82887/File/lotomemuze.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a753b501d---wifeniwipetevevude.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/simedafo.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/zonubodatekimimalaxemuxi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/739879915.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/2f21f6a2012687ffdd72c1767115949e/vavemawexiwodimagozi.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/sowenivetomotibubekemajuf.pdfIn PDF document text
    • https://coevent.ru/upload/files/29160914489.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/cj8a64btnl9pv4drb2ags9k3o6/73688032074.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d53ae18d---wepizolamoboserinovobiv.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2085fe5c6ccc4a8eb240882ff0948991/gumaxagalonenetirinurupug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+does+ecclesiastes+3+11+meanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10752 bytes
SHA-256: dc121c0ef93725394b1d4fe1524996bbd43281ec33bbf601d57440385c221dcc
font_02_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 17308 bytes
SHA-256: a65b072f43f4404ce4c6446d6823380b6d2ada2db3b6c57892c1a8eca7e527c5
font_03_sfnt_off00013683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 17084 bytes
SHA-256: 3c1c15eb42024120d96125f38444becc3c6203d1ccdb818a7c053a24c44c9671

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