Malicious PDF — malware analysis report

Static analysis result for SHA-256 043c781fc4d3d28e…

MALICIOUS

PDF

77.8 KB Created: 2021-08-27 09:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 4338dfec57f7bbd3e8d19a47f69c4ffd SHA-1: e40d9e739fdd389b822f20cd77c0850a1abdc6f8 SHA-256: 043c781fc4d3d28e454ad3c78376220a29be7d26dfce02cd1e8e16d3be7d4cf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and link farms, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://teleserviciomalaga.com/ckfinder/userfiles/files/wabolos.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae0d14ffb7---lazegux.pdfIn PDF document text
    • https://jslt.site/js/ckfinder/userfiles/files/gugefapanulibaguberesasu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1732e6317f2a6b5a5f8238b5ef44905d/fodanusopafu.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/guxokebinuzaxibumusovar.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/87911895335.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cf889570ed01440b774aac3879d50540/30608660505.pdfIn PDF document text
    • https://jotelek.hu/files/file/75790902799.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c629ddc329---vezobuwubawin.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161233f78e3648---50040996986.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/32090514063.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52f5ba8a---66922552907.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/sepitudosizewawewozu.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/47463623446.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/33998620860.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6d7685a2---84689609881.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/67016722713.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/4748544802.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac8725fc6---kabitogubi.pdfIn PDF document text
    • http://mobitransjogja.com/files/62227013354.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/63701485316.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/62b392bad9ed1a4e62554e4e67bc854b/91119285323.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0h94ppe66qt0o0c0msjj1vt255/11809093518.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/183chv3i4ujpb5c07cv796uv81/13066579487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+san+andreas+free+download+for+android+freePDF 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://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_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 16132 bytes
SHA-256: 74aaf7c5c5c9308fc250ac551e0fae448dd7335dc218994cb6ddf12b7aeefabf
font_01_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 10472 bytes
SHA-256: c04aeb2394e705014c27650ca247f342bde206f8df577b0cfe50a087209c1216