Malicious PDF — malware analysis report

Static analysis result for SHA-256 2676518f146a7ceb…

MALICIOUS

PDF

77.1 KB Created: 2021-11-13 22:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2fe2dcdd6479f3c00c37dfc4b84d9717 SHA-1: ae79b32c674c87983ab7f97e67a7edba19c57af3 SHA-256: 2676518f146a7ceb0e131ca259ec71450d135a6b9f6a53e7761627c1e6cff014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dfkcnc.shopper-store.net/file/file/makapanuge.pdf In PDF document text
    • http://ingmontagna.com/userfiles/files/5208704670.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/verobininesotugosikexal.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/88947875961.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/13988716949.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/kajofitakifemizuvemi.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-11-13/3ea6de4cf33e041cfc3b46bd94f959f4.pdfIn PDF document text
    • http://lulanjina.net/upload/files/63922136032.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1616ee02d56fe5---56248139454.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/18004707418.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/27706084291.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/15123396356.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/48733300433.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/raparijof.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/tesijimawipumexitiwuz.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0043c53a5---69277429170.pdfIn PDF document text
    • http://bamor.org/userfiles/file/95536068034.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/658744865b12bed33c8d5759c3809fb7/30434354950.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/segugaketetepo.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210913220928316.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/35109104523.pdfIn PDF document text
    • http://canadanur.com/resimler/files/97408682097.pdfIn PDF document text
    • http://akvarium-olbrecht.cz/upload/file/93886546716.pdfIn PDF document text
    • http://puisan.ru/uploads/file/18261131153.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=write+any+program+using+if+condition+with+for+loop+in+javaPDF 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_off0000c46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46E 11556 bytes
SHA-256: 16f19bd6c2637b480773cb879e606823f313847239cc30438e7e9d76246b59de
font_01_sfnt_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 18152 bytes
SHA-256: 48ab78361ccb0e2714ad246042332e60dba03303a24c0a19c574c619ffe5f405