Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca85c21c3ff9dc56…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 01:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 501d74c264eb483b907c2ff3150d670e SHA-1: 50c8791317d8c88a92e67477ef61dbc8654e20d3 SHA-256: ca85c21c3ff9dc5615d5e80f189378bab28d5550e974f52a4beb02c6ff48184b
164 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 a link farm pointing to compromised websites and disposable hosting, suggesting an attempt to distribute malware or phish for information. The presence of embedded URLs and the heuristic for a 'download button' lure further support this, indicating the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/12bc00556bcf1a4fab2b77ef4270f3aa/6709848960.pdf In PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57654959055.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/8613406511.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/96231313932.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/44521549635.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/84733051646.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///13556606526.pdfIn PDF document text
    • http://www.moyekolodin.com/files/10324275585.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/79795194532.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/cd4f15698fbd8dfdc36029bfb16c6e73/13798596483.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5d4fad5c02e25fb831957e6d5a423417/fibisepakosuxujovated.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/xataduxomumevopa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oq32vlau9r50sepmg2qvb8tv27/pifidofirizi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b340f7e66d5---naxoraxajosot.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fd340d66ac---laxavilorego.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/nofuvoxibimawonirus.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8652709c64afaf6bb3618d2e46cbbbc7/9338472304.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160858030506e3---ruxojel.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/87061267168.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/xugivutofonupelowosareto.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1559dcb4c---60083680498.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/abf0eeaf93089b407ca52370f98f0b25/24747475449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+to+iwork+pages+converter+freePDF 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_off0000cff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF5 16828 bytes
SHA-256: 3856323f6d9ed3b201382f6475bbcc42173525fcb166125ce903808e46f417bd
font_01_sfnt_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 10992 bytes
SHA-256: f592771ae79a9507145e47c66926ab37911f45befa2dd0c935736d0d2566ebe3

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