Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec709e5c5b254b3…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 23:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ce8292a1f110160d69f4fe515173fb8 SHA-1: db7de18b176cdc9538c28e21b995666dc2b66146 SHA-256: bec709e5c5b254b35da9e3658d27efc10c93a1efa772f5045988c572bff58c92
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://crewmak.ru/uplcv?utm_term=wortschatz+b2+liste+pdf PDF link annotation
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1626808274_6e96be6421.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/31398535270.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/jitozen.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/37954619000.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/jugogugewuposiniwu.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/18005450453.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rujujato.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/nolofubumobi.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/61852483317.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/cqtsfmfrppm5slhkh74olu93ko/53052541142.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/wowewazajidakajuxul.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/475411da3c268313737eaf4bc5addd77/25680217428.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/71901040245.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160839d1d5753c---totorizo.pdfIn PDF document text
    • https://nadamasristorante.it/file/60298883173.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b628cc373d7---somonowizakonawubunijis.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/51680940614.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/8ae38553132c29900c0512c925acedcd/22390411484.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094499aee378---27555973048.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8d7287da8584b82ea3cc6c16ebd97b6c/miremupofimiju.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/pqo2lp6s2hoal89b766p9hg9no/61118198961.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/11891937385.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_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 20464 bytes
SHA-256: 6e73047b71ec9af1e55db1a26e96b9f9fa93e2e371b4426a1750ef90ba27e19b
font_01_sfnt_off00011a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 10924 bytes
SHA-256: 9e0f7554f99c62d105dc798662f338c17dec09830e6b5c506027192ca80c413a

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