Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5aacb123d93b08…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 20:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9756af18719a233e7eeef8bff32175e SHA-1: 6d16f3618c7c7c4fdfe9e731895660af84d23eaa SHA-256: 4c5aacb123d93b08730c5b936814d364914e7a797a17e8cf53c6286991e321c7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by multiple heuristic firings related to link farms and compromised CMS uploads. The embedded URLs, such as 'https://childrencareandliteracysociety.org/userfiles/files/83353388369.pdf', likely serve as redirects to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, suggesting it's designed to trick users into visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=maine+atv+map+pdf PDF link annotation
    • https://walkandsmile.com/userfiles/file/95394803599.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4be66e97fd43485bff492482a8feaa5d/romogare.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/83353388369.pdfIn PDF document text
    • http://isvpro.com/custom/files/84924200710.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d734a6fc---68632041398.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/81814137080.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/d6168d88a932a66ba87f08e6876831b2/momerumorogaxape.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/55755002387.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/59740126764.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/58691030899.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/35119836304.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/86347295208.pdfIn PDF document text
    • http://geasit.it/userfiles/files/85227147025.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075acfee45d3---lofivopifopudofitirexu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160855472eb88f---19314777063.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161045d6cd6c54---37689469729.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wiraw.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2073594fbd---3280606783.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/33146924501.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/kotapejuzuguwimuratemug.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/sipap.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6hndslofv47n7oo9m0flo4v43f/navifalajexetet.pdfIn PDF document text
    • https://invest.pl/userfiles/file/rakugajopifegoboruwiwo.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/nekuxe.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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 10284 bytes
SHA-256: 32f6c64c63cdb6395df341e593c4c5b6a63b4e538883871791b6506528c66767
font_01_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 17888 bytes
SHA-256: 7d358e1a42bc27adee0df758d680f6a9c6098e86c3d5eb35376bc5cfae195716

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