Malicious PDF — malware analysis report

Static analysis result for SHA-256 21034207734356e3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 02:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02efbd274b9bbb6382a64a83712ae719 SHA-1: 0cfdfb5a34d0ac2a4a0e01c7dc4d239b19199882 SHA-256: 21034207734356e3cd141467447cc4e3343cc6cc00057768814f5b8a1c49d883
156 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://peoplehelppeople.net/uploads/File/72486374386.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3ccd4bffde1q4464e72d1tp2fq/63667073031.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/52851692614.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/30309841438.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904094844217508.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613021d458cbd---33866213571.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/xevebiridewupabin.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/vimilesewul.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/defejozamixoleseko.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/26363292124.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/90265635094.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/fujibigaleputun.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/45269890921.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210904061031.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/61602392244.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/lolimabutir.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/10010856725.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4lj4bkslu0lihhf07thompkjee/xibov.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/5696153584.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/djt1ojdskd9lsissm7l79oiqv3/98145098406.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/fixeluganafazusiwesutelew.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/lotobigig.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/941247968.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/59082622012.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/rerobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vidmate+2019+app+download+free+full+versionPDF 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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 11340 bytes
SHA-256: d159456c62fc489dc52ca257893e6958bfb4f1ae5b15393bffe3fd6536db4b46
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 18468 bytes
SHA-256: bda71303271e390cb6565408abe262e180fa0b22ad9bb32726f7aa27ab9621a0
font_02_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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