Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce2c22926c0f18…

MALICIOUS

PDF

80.9 KB Created: 2021-06-15 20:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2b783d83f36dfd5a395d01871f7fc21 SHA-1: 45f7abc2ab3104c6adc7a5fe76184c472bb710e9 SHA-256: c4ce2c22926c0f18e6b8a6ce0ef24b39eac8b766b1f6aa698447a0715bc89459
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure related to 'mini schnauzer puppies'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=mini+schnauzer+puppies+indiana
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dead6d69daa669f8ae9210ed62319dac/pakideresineguzinibiro.pdf
    • http://446888.top/userfiles/file/sotenatowom.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c87f00aa---64161320495.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e46ab59ad5---65885314917.pdf
    • http://www.annaleehuber.com/content_files/file/52416744469.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd40a91cc3---86852156704.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f4f2ba5aeb9893fdbe1bf46f1554432f/zinogepipaxer.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/66669699604.pdf
    • http://ray-king67reunion.com/clients/41562/File/91325161377.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab795cd2ceb---zupawojezatum.pdf
    • http://anjilh.com/uploadfile/file/%5C/2021050213575839.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7921d07b---javalikolavi.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b39adf866---fufesuweze.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b85f047835e5997701f4926fb42aa0c5/89218945514.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f100.bin
8b16d42b00b9d9ae0020bb6247d8c80c38f52b94fa15ed000d6d579da1b4d8cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 4876 bytes
font_01_sfnt_off00010183.bin
21ad012fdfeca76fc0d1cac301736c3e42e6b012c77bb4daa19ebfc9c9b8df3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 11664 bytes
font_02_sfnt_off000128b0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 4324 bytes

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