Malicious PDF — malware analysis report

Static analysis result for SHA-256 be436571b3df90f5…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 14:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fba76ee565b563d2320eba6a4ab5fe97 SHA-1: 435d67986f084dc73e053e79e5a00ae750e74046 SHA-256: be436571b3df90f5fd3bfde57fb2be699adb59c1d23fbaf83e9070b00dbe38e6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest an attempt to host and distribute further malicious content, likely disguised as legitimate documents like investment agreements. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=investment+agreement+template+pdf PDF link annotation
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ukkdo828j6unq28mm4o460nuct/vokurifimefi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/135c29192c2edb55fa2cf04d7673287b/17121005088.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/71722298849.pdfIn PDF document text
    • http://lucann.com/Upload/file/pepuzirutadirudemebibak.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f1d9511e---gogawimumajurazenikif.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/dokasis.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/38577291490.pdfIn PDF document text
    • http://ellev.fr/upload/files/tevunimunikol.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/fuxuladerepigofoxanef.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/davetikorove.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a935dabcb---66819926042.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/84692622869.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vaxijawon.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/3370578919.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b21ad7c66---lupefutubawokofuk.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b039d24dfd2---26067765814.pdfIn PDF document text
    • http://salkim.com/userfiles/file/rubuduzekisasasirenozobu.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/89690065846.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/60946350701.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0f7fd31b7---madesaw.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/6409183573.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/wifivawanomes.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/70280501399.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2977b0509981177f532d770c470689bb/79895387920.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_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10648 bytes
SHA-256: 5d38fe0dec2e345fac262e4884ec75feed3f630f97e52c8375679d3fccdc4111
font_01_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 18000 bytes
SHA-256: 94e425df5c059184be80365ba0d9deb0a4db0d8de28e09612d8630fdd7cf2c99

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