Malicious PDF — malware analysis report

Static analysis result for SHA-256 827276fcb16d2ccc…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 23:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b7681e7264c82fa8b3a63d65d9e5bae SHA-1: 4c05b0cbd3b368823223fab04ef88a73fa6d940a SHA-256: 827276fcb16d2cccc5a73e685f172789062d835801e0871e982f0b84d5f30b87
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress uploads and disposable hosting. The heuristic firings indicate malformed streams and a high ML score, strongly suggesting malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://catamma.ru/uplcv?utm_term=instaup+9.5+apk+download PDF link annotation
    • https://er-cardiff.com/eurostyl/photos/file/bawewavudapavuxokeriwa.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/96423891805.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139233171ae5---25434745274.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/36580147491.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/18618725198.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/84713916852.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210906185542.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/31066161831.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/kokidazusegaduxa.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/lowogofob.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vivoxagajixetoxefop.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rubos.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe86a4332---gariza.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/jezemagozonezivuma.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/94837342158.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/nekozixaxulomamaxoru.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ebc449dfea60f49c67bee6bd58818c97/nipifakov.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/54302985295.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/18c4d920ffd90c3b665fcf4e9f28d69f/sijogij.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/9216135025.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/idahps3ji0jnu94o6rqc6vrrqk/66324653659.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/jeziserajape.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/fabogurosejifibagorusupak.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/28726596618.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/40110671555.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 14380 bytes
SHA-256: 1606452fc6d9cfb20ec9dcaaf98d27ec009ef2c993dd9eb57cb3837b81db7b65
font_02_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10656 bytes
SHA-256: a5fc592d9d7d265f1afe05d95a43de9110d0ed829b8cf47532d00b1dac02f6a4

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