Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca93fcb6cbaeb7b2…

MALICIOUS

PDF

112.3 KB Created: 2021-09-07 03:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2cbcd434e7ecaaafa098659368d1217a SHA-1: b228441cee37cf7f044775dbc671126f6b0200f3 SHA-256: ca93fcb6cbaeb7b28e25c1fa78836ebd6c50e20220af0730606e4600fd655081
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://fishtech.org/uploads/userfiles/file/file/95770562655.pdf In PDF document text
    • http://hrt-foto.hu/_user/file/mufuxaxiduwi.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/44688386081.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b9d95f61---16081938511.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/74315474010.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b126b244b52bffeb86385911a75eb944/sufejemevo.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/18242817187.pdfIn PDF document text
    • https://actorconseil.com/files/file/pumejejeteva.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/31912258913.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6e5ad574aff83bf6a84b9cfd42ee8e57/63940906589.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/e2fb71f409be1e9ff550a551b9c8edaf/20791993810.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1f930f39---soduvozadosugexoraxod.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160878d4244ef6---gesexinujodekozepid.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/veval.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/25278b5c0e81517cd7fc1cc257f99698/keriwugetibometujuxobe.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce89a674ef---narigagajosapinixawenolis.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/21752835479.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/37453690694.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d1315884---samepamaset.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/92798368643.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/52403055518.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babffa263bf---wuxomoxu.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c08a908bfae3f840ff357db432164a51/gesemedamalowat.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f113b75225a---barilopagivalewekope.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rmn6m0ql7gmlp9g2b4klu3t5v7/vovidakogowowemuzaporu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=shamanism+in+korea+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_off00014a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A94 10788 bytes
SHA-256: ed2355429d0915fc2903ba60eb02c50556cc90d4b72602c07a7d6e6b6edfc14d
font_01_sfnt_off00016328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3A 21332 bytes
SHA-256: 06361fb8ae5d02b35f986acfc24f326ada4d4074c0429c25a9f7bf723f7e7e37