Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce28bc5d004db1d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 14:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b6918708299ae9e4323c1aad82c822c SHA-1: 0e41558c92fbff94e6c5939b3be8a2309b5679dc SHA-256: fce28bc5d004db1d0ddff9dabd30ca12370266f8ec4cd5d3229bf92b161f4780
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also contains numerous external URIs pointing to various websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=quran+pdf+for+mobile+with+urdu+translation PDF link annotation
    • http://fitnessklub-impuls.pl/uploads/assets/file/51919801347.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49aa3f390---59554131155.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/netigu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742a2e28cb6---59709524027.pdfIn PDF document text
    • https://nada70.org/userfiles/file/595921460.pdfIn PDF document text
    • http://szm.hu/userfiles/file/29344488785.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/81670714798.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/23914639085.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216161148158419.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/51872073573.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/80774582505.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0cc0df5cdc3696c58acf1bd07ed3741/40208229562.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/3710869069.pdfIn PDF document text
    • http://chenruichem.com/upload/files/gatisubujopagijet.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fa4a18eb6---89118881743.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/nuxivenisawotemalalij.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c44cdb7f0d959860793ac4c6dbc0c864/kazifawiveduj.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/94976937473.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/99061957478.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dce37088c---49047167574.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/basuram.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/48539570976.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce20c9ad42---mezitigebuzozodabet.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/fudumutag.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/koxepufadunejuvurego.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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 19736 bytes
SHA-256: 9a04e0bb945b586a9a570d2ed8020f879d06279a14586cb8ffd6feca89a4a93f
font_02_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 11148 bytes
SHA-256: 3772913381a66bfef46f1dabb48e1cca20434052bbe2f1db6dffdd504a260dd8

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