Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c41660948fa53b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 16:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e97ad55f8265bb543307008b405e76b SHA-1: 211d5f4b51f938579c5d59f98026c69af4c265a5 SHA-256: b3c41660948fa53bb302d85184ee893c8a82cd66b97d8c38cc2acc3264d0ae45
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF documents, many hosted on disposable or potentially compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 http://lindendirect.com/tempimg/file/sukizulinolofopavib.pdf In PDF document text
    • http://herium.net/FileData/ckfinder/files/20210912_333629F40BC1194D.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/jiderizuxisanowat.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/99043995082.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e793d145e---xofitelaruvepere.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/nokekubadadugeno.pdfIn PDF document text
    • http://ilkemymm.com/image/files/50145261940.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/bonipiforifibux.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a5298c740fc93d664f7aa7007a2344a9/85107612675.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/jugijad.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/xedikofilen.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/vomujuzoxezunu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161387eb5adc4c---lekupubipajow.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/rogatuxogugebusofomuwuwo.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/68557247512.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/94631870331.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/toguzuligidozipadigebari.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/rurijifuwumafesabav.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/xajugojobefulenovozesixu.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/puvugusaguge.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/pasolijejo.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/jojakawutozu.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/20099206856.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kamosirutimibo.pdfIn PDF document text
    • http://wohntraumgmbh.at/kelewiruji.pdfIn PDF document text
    • http://analhospital.net/file/files/91299439859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=a+quiet+place+2+out+yetPDF 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://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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 18824 bytes
SHA-256: 93fae18d0e7c76b6be3e78a16a6bfd2ea1707a7635651f9126a6cf677047358f
font_02_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 10456 bytes
SHA-256: 82b74e56dde49b7d252033c668657dc4208056feb059ee743d1ac80c98780fbb

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