Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc0a1ed3c994ef0…

MALICIOUS

PDF

84.3 KB Created: 2021-08-21 05:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b749ab9ec022893b7b01361f13cae783 SHA-1: de1ccafc354297dfaa03b1232c332efa2a47e23e SHA-256: 8cc0a1ed3c994ef0eef004afb37f1e8f5eb59512b49e709437a8005fa411f38b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rijst.nu/userfiles/file/dumafujepisasofase.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/s6eaqopv0tk0hmndreu1rbukts/sexonamuda.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805cb327c4e---93309187948.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f82429a9c21308113e8036e18987cfa7/duguxafaguwazabuxekapuxu.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/36912681788.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/xafet.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/45516092386.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/guludikimulazizoruda.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/xoxolulepenujujiduror.pdfIn PDF document text
    • https://eklyps.net/images/file/minolilunole.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4f47a1f3747708d284d86bf53ab5c3a0/14306818575.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/66363512492.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb700f183f---jijidozodivukul.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160abf772ae026---senafapeje.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/jukawoduliwuxotozava.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/sivizokikuxemaditiwuros.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210721_45A124C05E8EA388.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9a3ddc8302189ee41be4566f1c76704a/vomuvukuzagurofidibuzew.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/kikovivifedarovabuben.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16094bcb47eb73---71688480130.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbfb8dcb1f---88623398563.pdfIn PDF document text
    • https://khanikango.in/file/sumulutatajiwixorebiz.pdfIn PDF document text
    • https://latework.cz/soubory/motubazodepumod.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/45161667238.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1f7umhn2e4s0d0fabjhdtf5rdh/lizururi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=traductor+de+ingles+a+espa%C3%B1ol+archivos+pdf+gratisPDF 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_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 11232 bytes
SHA-256: df54556861356c520e3f59fbb684d305b08766aa0c5dfb8b8adbc6fb3ecc25a4
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 17716 bytes
SHA-256: 1adde108b31aa23c4ad96a6af5f40db8ecd8df49b1344784bd2fbdb531b7547a

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