Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a97f24fd85a588…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 07:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df4263f5dab36b52cc7ac3d3df5c78d3 SHA-1: d473d9e7d091f1e3f9d8c6ba4c0b54c0eaa2dc7b SHA-256: 10a97f24fd85a58832c765c1ebc976fbb94ae8e248fddb2b11ecdd9e705dd42c
172 Risk Score

Malware Insights

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

The sample is a malicious PDF, as indicated by ClamAV detection and ML classification. It contains embedded JavaScript and presents a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of multiple links on disposable hosting and compromised upload directories strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hc09m1h5qmuepj2hqgocnro8kd/7404619724.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf87fb7d02---pelajunisesotadapuzuvakir.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/xumeguz.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/76732051867.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/5640844562.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hqsd8am2fh32jnehbop359rndo/jepekakabilebabalokasaf.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/pgobfrt0kaqnhvhmbj93al6gav/xavabefivibimar.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/77673932983.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/baranokejelepofisi.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738b9088918---wefol.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/55698995705.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73c77536b---87448919790.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wafixufaboponaxapowed.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/xexakujel.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1d7f228f3b2ffe418be55ac3d4fdc415/monewerawimuronuforam.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf4b1d97a24b60ce76fc9e40e9d85f62/xivuwedutamumufeletagezov.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16114bcd6f06a3---divegakuwidubevowaruga.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/73cd33ed599508f3d2fa1ed407b5775f/wemowozip.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/gatekolebinofasiw.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/jikupiza.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36145fc20---raxegezazazokefox.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/85435592277.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/pejn3ap6gtkuou4rdsi6g6o97j/fomakozeg.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4870a482c10a9d89eb7c525813ee51c9/21651957132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=engineering+drawing+book+by+nd+bhatt+pdf+downloadPDF 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_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 18696 bytes
SHA-256: 0833b602a53d774817db27145a03745206ee8a2c0485441850ccf837f8345ade
font_01_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 11024 bytes
SHA-256: 8f3c9c3bab79b2e1b6fd48c14dd3f84ba0165a23492879f0986c5d68ec2af568
font_02_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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