Malicious PDF — malware analysis report

Static analysis result for SHA-256 979fc44cc30b4a51…

MALICIOUS

PDF

85.5 KB Created: 2021-07-05 03:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da92e4e5447bddeb1e64e2ec6d1f73eb SHA-1: b904f14bc44b8be8bf8ac07f991a6b1b5e603057 SHA-256: 979fc44cc30b4a51a0195779af3b3f947bf3bf6a50e35220ad5e7db85b17ebeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, identified by heuristics as a link farm on disposable hosting and compromised CMS uploads. ClamAV and ML classifiers strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it is designed to redirect users to malicious sites, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://kipass.fr/userfiles/file/1985424806.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/mipaj.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8f70a2d4---20200432243.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qjmoav2j45ivrdbb74ch9jvhav/6717981592.pdf
    • http://safarang.com/basefile/files/28809053828.pdf
    • http://digifast.cz/userfiles/nolulusawobadu.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/xibukigoxuxibaxito.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b1e391f2---64768855562.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f81dd3c366431f6ccedf91ea0ec4fc37/jezibotiketale.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baafe34c963---xuteravefowosuladozakazu.pdf
    • http://allamericannursing.com/userfiles/file/zupexavobip.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/56491909596.pdf
    • http://bezpiecznamlodosc.org/files/file/13071271976.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/45167585488.pdf
    • https://keluargamimpi.com/contents//files/faxigogadasafun.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6065cd0973dbeef770f55ec35d1cad6b/38486014574.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0q6vkbnvqljdkbipbmo4k7mh6c/99850962696.pdf
    • https://fablab808.com/nbloom/fckuploads/file/16005049299.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160898032d8c76---85162048527.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/cfcdcc661e3913924828dc7fd6e921e7/45751480271.pdf
    • http://matchonusa.com/uploads/files/lafawuxiseno.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=get+mold+off+shower+curtain
    • 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_off0000eac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 16792 bytes
font_01_sfnt_off000102df.bin
3c21f7d59f81aea688521740bda24897197114b8211fe0d47c01c61df1c2fc85
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10964 bytes
font_02_sfnt_off00011c2d.bin
05f8c62d69c66838f4466719d36eefd0e3949f9ea72ca2c5b9494d917c720617
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 17148 bytes