Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3ca56540556b81…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 21:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e727dbeebeb58086aa1742dab0acfa9 SHA-1: a69aa190ca7c9ed4886dd56ecec277bcbac490b9 SHA-256: 7a3ca56540556b81458d51008297dc51f1c8b3465791bf2a559fd3aa7c7b32af
204 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=make+your+own+neural+network+by+tariq+rashid PDF link annotation
    • http://www.zywawiara.pl/pliki/revurodexovakisev.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/95329508310.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/8744834657.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_A7512D3E075AEA0E.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16136d51d549ea---68174390669.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/zikupekimaxigitiwadali.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/fafafaj.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/surakotipazavo.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/sitakuwaniwozexu.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/63142338610.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/67910775671.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/mizakigalegusaxutekopo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130c961ce10d---98947638862.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/kuxagazoguziv.pdfIn PDF document text
    • http://asqcert.net/files/files/naxoxololazi.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/61404811451.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/mozeju.pdfIn PDF document text
    • http://iscelenie.info/files/file/48251058505.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614028b2dcaa3---98341247330.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-6/20210906043310872675.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/51657002280.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443a5a387f3---topeziditufirozojorawise.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/18106588532.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_off0000c25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 18048 bytes
SHA-256: d41dfb8efb5c0f147c04e4551face9b5ff61d67678a137f27f758de3dc1a3f78
font_02_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 11016 bytes
SHA-256: 04c3ccb03585832b58e4855e0bcc0acba5a25de4994d4cf98f1d4c6469c35c66

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