Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b43fdfe3ae8259d…

MALICIOUS

PDF

84.6 KB Created: 2021-08-27 23:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0f9be536972b0e16e659ac80444f672 SHA-1: 95393e50c5ea9d64cc10df0dc94739874a450507 SHA-256: 2b43fdfe3ae8259d285b6b536dc7e08bfda95b20b3019f070cce8bf7271c016f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=unspecified+psychosis+dsm+5 PDF link annotation
    • http://africa-emergence2019.com/userfiles/file/nikexewotoxijodikebudovi.pdfIn PDF document text
    • https://dineflon.com//files/tosolukurelezelige.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/kedixililisejuvaxipiwa.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611b20ead4745---kuxiti.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/sogulepibugazutuladisava.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/domijulaxakuvubobevakuzo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/mirinikit.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/mixeje.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608620fde4d1f---15089023150.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735fb3ae055---64701670714.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/gorufi.pdfIn PDF document text
    • https://renhedc.com/uploads//files/202108100658519563.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a51c192c6ec8b3999e45c07644300560/fevokomediwepafazox.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80a35130c---11635383079.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/dunimusosamumewafes.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/getasisuve.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/aaae2d7f941a2537851e8010f76a7ac3/kefiwoxaduzipabuf.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/xuxitudenebikebuwino.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/sujuzaba.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/6914847473.pdfIn PDF document text
    • http://placc.info/up_image/munetanebijig.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160758087d8700---99932230030.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 18100 bytes
SHA-256: 38148df8e59a7f28c6f8d16b9423acd06c34b77bd9388993b284a35c50e8ee0e
font_02_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 10736 bytes
SHA-256: b433a623fdcca05627ab027aa9796a580bb3c0d4b0c2bfda031f12c0c13a0c3b
font_03_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 16868 bytes
SHA-256: 5e14b43f0ed10bf21d976c6171f47356308b2e97adab6127076aafbcee14eab1

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