Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2c247510a54bb7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 14:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac1c4caf89b40d7d96eac13f908c5fa7 SHA-1: 613d96e040d91ff60d45e4ffc8087980ccdc165b SHA-256: 0b2c247510a54bb7c6fe239905222521a706de47fac260bb2dcace62be1a824b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and potentially trojan delivery. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=bullet+force+apk PDF link annotation
    • http://ownlines.com/upfiles/file/nilixojerukokufimefaduxe.pdfIn PDF document text
    • http://lovesenergy.com/file/73963837832.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/munovuzagapivabej.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/damebasaxi.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/kemifozuwetuxavasogivig.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/48489078437.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/kebikusukulurerovanarof.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/rurebuvip.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/tujojulazomolipokakote.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e4ccf5738de1a043a0b87d14a3ef1dbf/dozifagejasogaze.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/sopumamona.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/54e8ea40162ea6d7124eb69026abc1bd/kobarikovepiveganavegele.pdfIn PDF document text
    • http://shopabrang.com/images/files/46759418334.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/botujovubukutenikewuto.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/kedijuravurizesitiluzoz.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/nipasu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139370ee8030---pegewuzenogomize.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/fobifetatisenapidefa.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/dilatulifalasojatoxadepe.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/13413099598.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/26912054804.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/zeroponejuteg.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/jutufafomuroribiba.pdfIn PDF document text
    • https://ultralloy.net/upload/files/47562255215.pdfIn PDF document text
    • 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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 10356 bytes
SHA-256: c69c865495334b6d9d4d8b4b52464f373567c836598f50dc6c146be20f4333ae
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 17692 bytes
SHA-256: 10326bb010b13130bfdc8539420422947ec562a5fdf0cf44a760b19223959dac
font_02_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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