Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a84d4cbb3cd080…

MALICIOUS

PDF

113.2 KB Created: 2021-06-30 03:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dd0dd1984a243996aad6ad0a8d19840c SHA-1: dcbf1b40300bbfe1172e2b28bb4e1431855fdeff SHA-256: 43a84d4cbb3cd080bb3f0d443de518ca7d2b05cb20fbc33feec8443ac296ce71
156 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 phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/81e1f5ae26c56f7404f5b97b05285f0e/46565787048.pdf In PDF document text
    • http://stardentalcare.org/userfiles/file/62625745537.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/tuxutaw.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c49539eb---mawoviweniwoxomala.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/23237678843.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/96d34dcdee767fdc7ff22a4edb41666e/kegiputorokami.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c83d898---5766015843.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8d9b6b48---jawolofenolubef.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6db325398---97938857904.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebe6817c8c---numodugonuvob.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080618cc771a---fufuzodapovepofajoro.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/winujixufeg.pdfIn PDF document text
    • http://hevolta.com/upload/file/mamugaruwatorula.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/dakaxazerovete.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/26813851623.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/55945c0c7177f2959213b3e21463f259/woluvarakoxufise.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4df7f3d71---92089207278.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ecvlocv08gep7871912g0lsned/tavegamuvelabivinuwewa.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f22df0fa62fc8d3054c3e41ade5dce11/dukumokutatozaradijozosu.pdfIn PDF document text
    • http://e-sportis.com/images/upload/bulujubalodofufozidu.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/guxatawuresexas.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927241f17ef---45738854086.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/5ba7879e8baf333eec5d4658bebffab8/94013399517.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/soxekemabezeputaguduwafa.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468f942e36---vemasosu.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a52032ba6---76956538529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+last+temptation+of+christ+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00013893.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13893 31928 bytes
SHA-256: 9a73f0513c5c8e8d36b208f763ec6d205144b3b8a9fa40ad60a9cdc83e5d8c2a
font_00_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17195 16980 bytes
SHA-256: 156ec4f1dd797dbb524b134e3bdc0e2c938a7d2c8838a05eda08ffbaab2c3b5e
font_03_sfnt_off00019d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D4A 11080 bytes
SHA-256: 645ed0adf5ec4c2cc7215c107defea2f09f0f5f4ae56f5e53337c7509a6dbf32

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