Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad792ca7d93df45…

MALICIOUS

PDF

90.2 KB Created: 2021-07-01 18:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23e12323db972258df721eba6b34aca6 SHA-1: 09e897a2188a74cc4dbf9c4c54f567fbee195ecd SHA-256: 6ad792ca7d93df457c48a93937fe67bde7cd5bc670dc6efb95c5c571e0a463ab
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URIs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://philabc.ru/uplcv?utm_term=germ+meaning+in+tamil
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd50e0373b1---93663643918.pdf
    • http://meechoktoolmart.com/user_img/files/nonodagomutezudajanajolo.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7becee0a11e0d0e44282e08f37497800/79025358825.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/91b03451c0326666d7dde89bbacb9dde/merijifimogokifesofalanap.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4gscp33t4v7lbr3b14ruo0hejr/sanuzetuvataduko.pdf
    • http://younewstoday.com/task/userimages/file/71538540926.pdf
    • https://ctapigroup3.com/contents//files/11533151253.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a09203fd2dbde3ebdd1ca9127409186a/46203614739.pdf
    • https://biothiennam.com/media/ftp/file/getopesu.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6330c524c2---82695975108.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f268967711---pejujidonedawugujuselo.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b597ad3ddc2---napabogiwiguzafu.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a590830f1---74481960510.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b7c4dc1d121e672e47b9126b8f0b0b23/40451855023.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ad108def0---23966873500.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dab719c60---87498273302.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c411093c21c---ripiz.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/e35u6557cda1pt7aqfeon0qfvp/17662850354.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d2356452---piwowesowexumu.pdf
    • http://aucoindeshalles.com/menu/file/52149118722.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/25edc6e31cf78495e3e39af524ee3ae9/fogixivipemerizofire.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/38444903040.pdf
    • https://mn-lawfirm.com/box/userfiles/file/libizerawepugijufop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF6 16792 bytes
font_01_sfnt_off00011408.bin
bb7d483ed0d1b0737aaefdd0956730e6e235ef763fab23be28c8c2d5cb23b7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 18632 bytes
font_02_sfnt_off00014341.bin
45b54392e042c55fd89e7f4924df76f6c7cf0e4c8c498544eaafea94bc5617bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14341 10204 bytes

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