Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a00290ff294352…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 09:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74cc42d87fe2442b54f9ad6b489be6d3 SHA-1: 40430cbc0b3a193f63b056fd48e76898dbc9505d SHA-256: d7a00290ff294352369738487c66a201d8f640ff9de2b48f2fab8a81a865c75e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aparcaderoshaddaichile.cl/uploads/images/files/81693128124.pdf In PDF document text
    • http://sxhk365.com/uploads/file///72539703006.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/bewimiwodabom.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/47689264593.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ea8f1b77---kukerodozujewabavafubel.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/41442620533.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/neferopusizibi.pdfIn PDF document text
    • http://hchoanglong.vn/userfiles/file/lolux.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/o9f7r6kv50gdpc753neoi8mehk/9413314047.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pvjb56m1aff77m4kqbbmjjvmuh/97324150352.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/xezepasefumabinogexano.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/gafonakexope.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/58553024995.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/78551482700.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e499642fb24---25699691872.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742ab491e6a---24550622782.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/koguxuxezumusat.pdfIn PDF document text
    • https://purefeeling8.com/data/file/38029135958.pdfIn PDF document text
    • http://vhktn.at/images/content/files/jibijagolabefalerelekinod.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/bavubaxexawiwuva.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/18ebaed0ed06b8744ade32cc66113710/dowipunewurijeraxozam.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2cc1ca4ad74fdc70bc90c3aedcc42bbb/tagidaderiraxarinavapud.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a515251e3---52923749973.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13918c6cfb---lefibulabipofesi.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/wofuwebiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gentle+reminder+mail+to+bossPDF 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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 17996 bytes
SHA-256: 5c4114b8bee7c364a3fd60efff5a3d353e8ee53b63668b0275193f4fb8f41bbc
font_01_sfnt_off000126e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E8 10588 bytes
SHA-256: 405686f7f866110d32ca5ecb428788a3d85b5d25236b9a536809a14775e18530
font_02_sfnt_off00013f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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