Malicious PDF — malware analysis report

Static analysis result for SHA-256 950124f68bd367c5…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 05:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58540779e05d4ed17c14c5e1b780ab7b SHA-1: c7a6bdcaaa690e5737fcf63656dc687ec351dd9a SHA-256: 950124f68bd367c57fababb879e4d8cbf72e8c297dee99aa4aa81ec2e942e7bc
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised CMS upload storage and uses a visual download button lure. The presence of numerous unknown URLs, many hosted on compromised WordPress sites, suggests an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9340199a---nefamokozivi.pdf In PDF document text
    • http://garmagostaran.com/Upload/file/1539145461.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210603062603.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/lurabolesenabuvavowin.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adde3a073a2---25159823496.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/zafemuxinoguzebodi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072608e11c3c---sadazogewobidixudapato.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d17d54fb0a9a8f912df12da81650ea24/tatatakinibetasasiw.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nm4e53li6runjmbdcamm61r9s3/woxebiwaterobetototuw.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/jokodaxa.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/48056757834.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b10eda6c5---93760262130.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/11514048728.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/81f22fcd4cd221f41f8a742f8a05095a/gelod.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/zazuronijej.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/26889785733.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/80712873027.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/21961656720.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/torot.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/506608808.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/22406045744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=up+police+constable+syllabus+2018+pdfPDF 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_off0000b688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB688 17856 bytes
SHA-256: 300b18bd456bdfe0c6d18d80d67015f0d7b72c87bcded11084562c4da455a671
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 11376 bytes
SHA-256: 74b0697a76fa811a771f999c515ab0a21450e4f6399931bd99cc049e241a7a85

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