Malicious PDF — malware analysis report

Static analysis result for SHA-256 404219dd6993a165…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 21:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 845bad385c860a8f039a4196d38a028e SHA-1: 3d3e3e8e7b28ba03428af1de2efb464efd2e6d48 SHA-256: 404219dd6993a1654b9eeddda49e48e42d6fe7c7bbb348b7fd7a0348c8353214
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and embedded links are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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 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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613715b0a3940---mewumibufatugerawe.pdf In PDF document text
    • http://fese.in/ienupdimages/images/files/15158897835.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/xutemodijevul.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/54473695020.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/57075723078.pdfIn PDF document text
    • http://autovoda.ru/upload/files/48482022766.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/xitedifegodev.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/nanasuzobowogeporivip.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/75190910955.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/wuvegunulin.pdfIn PDF document text
    • http://rs-entp.com/upload/file/lirup.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5016279---rezeboxaw.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/67745238183.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/fiselujimobunazojegebijed.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/8955338624.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/66390608880.pdfIn PDF document text
    • http://guowangcable.com/d/files/kuludelukelodod.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/dijuzibiwupefirizeweseg.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/51600474347.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/77945638409.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/kofutipok.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/linom.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/20533851477.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416618c580c---11226259906.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/48526589105.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a1792b9a7---fanokugeworifazin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ola+party+apk+downloadPDF 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_off0000be16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 10312 bytes
SHA-256: 5230f60779a0131de6fec3e28ed582f0d4b56b0b1523298ea8e276d796e132f8
font_02_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 17364 bytes
SHA-256: a877ba6521b6f71374dabcdde04950ec602948072ef817cbe86e33986bc0358c

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