Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae2b0bfc756de69…

MALICIOUS

PDF

85.4 KB Created: 2021-08-19 10:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 29ff4441dd8369cde60f72b5e484e1e1 SHA-1: d9d377669c4c31b2f7a55c083e0a67b8aec4cde9 SHA-256: cae2b0bfc756de69b8443b863c3ad95df3d5097e9116be50e59fcceb201b9f54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. The file's structure as a link farm suggests an attempt to obscure the ultimate destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010c2c5bf05---pigujipobujepogesejome.pdf In PDF document text
    • http://bettynblue.com/upload/fck_img/20210615/file/86669002874.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ojc0jom5a1ov60mhivce2fuo64/53811745011.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/menexezopuvaxinena.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/68290681273.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/df9c93251e73ef66ca6c1b4e6527859e/jadomanuvomuleto.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/bobetumevuxotatojagakuz.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/208c4d14a848cbb7442868de740546c8/mimami.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fe9626def19b0a381ac2a1552f50f480/jonikiwofejisugabijibovu.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/2738334842.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/widilozeka.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/rizejawedojol.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd067dfbb6---58639877734.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/74213b912f9a63b570d6d9da6b05e765/tedigaxidujanexabujilu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/sowepaxekedesolut.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/20613902618.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be825576cd3---barijifilumesatefikusogix.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xisuzujinapuvolozojobo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0e19d56dd24ef32212ee02aeafdb5f24/46668539073.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/tegelakokizuduva.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a065078b85c---vuwatozikokabaxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pierre+choderlos+de+laclos+biographie+courte+bacPDF 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_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 18740 bytes
SHA-256: 6ef559e9e7b466ed63303cedb9d9ec16945a072af074ad17b6e4933f46fb5caa
font_01_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD4 10932 bytes
SHA-256: 548efd38f289d0e1c5794e4e0b966de57062116f72581a92ddc9270ffdca12fb

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