Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bec290cd2cbdb28…

MALICIOUS

PDF

73.9 KB Created: 2021-09-14 09:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22c9ab646474c5507bb5373a868af35c SHA-1: ba347ea9320066593fc18fa21d0f8b65a7791f45 SHA-256: 6bec290cd2cbdb281b3e098a993db5492e78024b378710d8a4fcafc160e4dce6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://maritime-models.com/userfiles/file/pumilikegorawafal.pdf In PDF document text
    • http://dansungsala.com/uploads/files/metoradozelexi.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/9125154661.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/63292403662.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/rixowisudojiridajimi.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/budemeruvapetikupup.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/21519122057.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/digazeburagaraxip.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zasasinepojemivuliza.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/68681734325.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/703e111dcd650e662e19c5e95344e60c/nojetowafosum.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/83219230367.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/16433478307.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613479ed6bd97---16836783336.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/lolazuxafilesid.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/neluzekonuxafezifub.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/setatobixofujemuxitunawus.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/gojilogigaxexojiximanu.pdfIn PDF document text
    • http://effektfilm.de/files/file/37993569588.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/11499445077.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb96ad20ab---gegumevopenizev.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/17125639760.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/tefolezewizo.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/zotuvo.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/sigaj.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/kiloxabomatomolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=memories+roblox+idPDF 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_off0000bf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF99 10280 bytes
SHA-256: f88e713762597e3130578de2e1e72f83316ba3596146a02842e7633dc7e9d40b
font_01_sfnt_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 16864 bytes
SHA-256: 6e104da234f1a9604776194415ff6fdb2f5f3513e3a95d57cb524c6500e68d26
font_02_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1