Malicious PDF — malware analysis report

Static analysis result for SHA-256 998e4afe423fa42e…

MALICIOUS

PDF

82.9 KB Created: 2021-07-25 00:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a47357de03ec268836e9c9b96c619f2 SHA-1: 78142d1c34483b407199756ad1c5e6e6be517c4a SHA-256: 998e4afe423fa42e987dcb497a08264fe13af41297bb5ee8705566719e571d4c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the nature of the links and the PDF format itself can be exploited to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2250b37c575a99db6c13707b622e0846/81952868456.pdf
    • http://luingpyrex.cz/foto/Image/file/88804171194.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e983fb8edf3d086d2a30cf11324aa320/kaxolibibev.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/lijirazuli.pdf
    • http://geodavidepini.it/userfiles/files/lodozuxomupapusozogimubog.pdf
    • https://oklogistic.lv/upload/file/62065940897.pdf
    • http://amongelite.com/ci/userfiles/files/87509767533.pdf
    • http://veterinariogiardinelli.it/userfiles/files/40273367014.pdf
    • http://ash-graphy.com/userfiles/file/rinejazeve.pdf
    • https://zivotzaokny.eu/res/file/43152210224.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1ed155d1---vilefemijutis.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba995d5fb5---norosexegerigimil.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/hc608sb85qa3l3lqtort559dbc/jebupud.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e9bd5b1f133c4ec60eb2528cdfefe5e2/32106386549.pdf
    • http://yule-sign.com/upload/editor/file/20210624160914.pdf
    • https://aduanaldelvalle.com/userfiles/file/jagepotipafikewas.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1n1dru65bktv29rctkgm9ulfs7/18661127279.pdf
    • http://intergeored.com/upload/File/gisusad.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zujitezirin.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/83206893043.pdf
    • http://metallpress.ru/files/zimigafikuri.pdf
    • http://villalapinetafavignana.it/userfiles/files/56068433440.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+make+a+4m+kcl+solution
    • 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_off0000dee5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 16792 bytes
font_01_sfnt_off0000f6f7.bin
7ae71fb20d1aa08785d8e85fb4b368ec21f8ec1d3ff506bbf331b3f6acb48608
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 17264 bytes
font_02_sfnt_off00012469.bin
0d10dd98779193109883ee97a8a37329227b4db62a5f0ab5121c3f99725bdf68
pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 10892 bytes