Malicious PDF — malware analysis report

Static analysis result for SHA-256 379b3920c17c1e2b…

MALICIOUS

PDF

78.4 KB Created: 2021-08-11 03:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 18268515854685dfa9bbc600e1257585 SHA-1: 0b4c03f1d9607895beb8c7dc3813b27e3aca96bb SHA-256: 379b3920c17c1e2bc1d1fa17f19016545617ebf9d3e4cc562d1d7aa08bd2f858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm intended to redirect users. The PDF structure and embedded links indicate it's likely used in a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2e8ac4a4e21ae1ca7aed152a8051c296/69876199817.pdf In PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/lodeveluzesoluju.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c96bb2b0212---toweralamelapenaso.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f646c751f2---67818133706.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210804081231.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jrt7b89ibik3c140ei9c4llfak/88461656071.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/1834232797.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c04740226---vovotibuvosibanafox.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c6c06b60---19393361044.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/75020e66e38cbbfbd5fac77b8daca74b/67331569932.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e49f2e95aec---89518631654.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/54a874754e84c93225a2d469afcc7521/81538334061.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/japanilakofux.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4b8b54de9dff0875ebd642bcece51528/23625357224.pdfIn PDF document text
    • https://inks.bg/userfiles/file/jeferujujebisuxeb.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/26469705355.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/zerelininel.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/38585300084.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ke3b7u0pk0cej6hjd9tamih7v8/tuwevaxasef.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/76582280458.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/85272685781.pdfIn PDF document text
    • https://majubesar.org/contents//files/28320319983.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/zekiminutapazaz.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/jujapotajav.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/wugogomawodaka.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/denazotedasiwutonudulid.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c686e68fd---65083404996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=present+simple+affirmative+negative+and+questions+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 17928 bytes
SHA-256: 3453e256d41c6976f7a828049ab7fc620b3973bbed413ab63f8031d0ad0e89c3
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 11156 bytes
SHA-256: 100807771a6b656b4f699620aead9dc2928f5d763eb051a50a05c9da68cef862
font_02_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1