Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaa07a2bf501bf5…

MALICIOUS

PDF

75.5 KB Created: 2021-07-18 04:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 97ef3285bd4df22fa22820dadbdc528b SHA-1: 12ae5a0e9ae5ed74dd1de54148d0dded2c0dcf4b SHA-256: caaa07a2bf501bf56c0e566029e55f0173c99eb625bde4c087144ee2ffb0a7c5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm hosted on disposable domains, a common tactic to distribute malware or phishing content. The presence of a 'Password-protected archive handoff' heuristic suggests the PDF is designed to trick the user into downloading an encrypted file, likely containing a secondary payload, after providing decryption instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160916880832ff---16322374731.pdf In PDF document text
    • http://vetcarefoundation.org/userfiles/file/munokimudozuluz.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd328caef5---3555136059.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/42701974061.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/78060758820.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/7ed04dd2c964ab8d480a74eee8dfa51a/nobezozakinokepegevaw.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/babepowu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8h2ug85n5l9msrmel18pk4urtr/soranise.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/dijevewuxuvoluvemonej.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/wexukukikimazivepuk.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847caf89c52---43353736077.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/zelemufowabenonisulumi.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/75956601302.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0f87f63e0cded252f285eb300e0128a7/89518354081.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3848ae629---25801676410.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a0ef6a794409de746edf6e307aab390f/53182468505.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/8611533372.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607160e227536---livefi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba8f2ee06---zumolarosimutikoketip.pdfIn PDF document text
    • https://argumentua.com/i/file/77830277867.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e42478f83---82876428990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=an+introduction+to+formal+languages+and+automata+solution+manual+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_off0000c1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 17112 bytes
SHA-256: bc06b8d6ca995fd1ae1b5294b623d83e1f04c836e6bc8db46806e824f7e72b8b
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 11044 bytes
SHA-256: 1871eeaa0c9cef959cfaebb7f6b17311d702abc8dca55d50a09f04be78ecce06
font_02_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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