Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3cdc23b5f67ce0…

MALICIOUS

PDF

95.9 KB Created: 2021-09-18 21:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4308f4e54de74445230b9f20dbffab85 SHA-1: b248227cc18eca449c4988a5554680cbe9a2b05e SHA-256: 0b3cdc23b5f67ce0a39d76fbb38729f0b40559aaf6be045413080ccbac2978f9
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external sites, some hosted on compromised CMS platforms, suggesting it is used to distribute further malware or phishing content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 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.
  • 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://philabc.ru/uplcv?utm_term=rom+pokemon+alpha+sapphire PDF link annotation
    • https://i-chat.tw/js/ckfinder/userfiles/files/xelenikiluweliso.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/gimomirotovowix.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7afe763f038dcb0993b2d81390e98237/ladelifopixutel.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/20888613923.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/loxato.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/41068351944.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/redadozape.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210917002324152.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/17190702873.pdfIn PDF document text
    • http://dges.in/userfiles/file/7378004519.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613182b460a6e---tolusar.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/98415988623.pdfIn PDF document text
    • https://dintek.eu/uploads/file/87839641931.pdfIn PDF document text
    • https://pcetravel.com/files/file/vutazekaduzupiwikepax.pdfIn PDF document text
    • http://pasaru.com/upload/files/nosatomo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-4/20210904194255829075.pdfIn PDF document text
    • http://medica-brno.com/files/tokeninuzava.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0d68656185835d250d79cb9f7761a81d/gomosibitunorajumanodum.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b61eb73b---93991637709.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/81869391686.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/14314728222.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/73635397194.pdfIn PDF document text
    • http://iviltra.lt/images/files/lepezilafawulalaw.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_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 19512 bytes
SHA-256: fa3b180d0fc5c53dcfea769dc34ab974ee1bc8b1ddbbbd1d042258de075b0070
font_01_sfnt_off00014204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14204 10556 bytes
SHA-256: b1148b4bd3a3e50687ff9ec2dcce3cd8bb1f389752c300a55c34a2287344f31a
font_02_sfnt_off000159d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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