Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27483bf8be764c6…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 21:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 427690e8951327518b3ba45443479fa3 SHA-1: 3c61d4f29ca2784d70a10cdbb6a0b41a51b2e708 SHA-256: b27483bf8be764c694db6f78c7aadddee4ef37256af3604e26c2476ab57f1ddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous external links points to a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://archism.ru/uplcv?utm_term=vlookup+if+not+found+return+0 PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156a5765113a---suvazavikufesotidisarifix.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/cttchq9vdvg1i1k4urlovvd0vq/ferixasoj.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/67ff91e1a08fa4cbc6a1cc42a0b427c4/67444276053.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/raruzurifizatemidomave.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130939483020---87411205956.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/suvefuge.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/kofiluwafa.pdfIn PDF document text
    • http://e-sportis.com/images/upload/41251835375.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/purapufotasagepowowes.pdfIn PDF document text
    • https://svltv.in/userfiles/files/birupuje.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/80017559351.pdfIn PDF document text
    • https://luminex.pl/upload/file/dofomibekisifuvigirerob.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/fatogid.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/73130180286.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/viwesesesoxasexerozomojam.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/fevijaneduv.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/romasatupabejakep.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/29968123610.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/ledovodilo.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/geruxivazif.pdfIn PDF document text
    • http://lulanjina.net/upload/files/28311510940.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04e48f74b0948201e5f9ee64de33ca07/54085970744.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210922_ED59E2815D718D2B.pdfIn PDF document text
    • http://thaide.org/userfiles/file/35392889181.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/nuresinovuzadeforusemoju.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/88322502669.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/86581d23f22d9c21a8b127e81c1ff0c5/97165440659.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613ad58cf3ea6.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_off0000b805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB805 15192 bytes
SHA-256: ce24c6b2deb9946e63def5331366f0ab9c80ef0dff31f1a093e5285a3feac36d
font_01_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 10444 bytes
SHA-256: f2574510c53d9f94d81d6b66981339b0135e49331c5ad5c6f07fcbc832365954

Open this report in the interactive analyzer, or submit your own file for analysis.