Malicious PDF — malware analysis report

Static analysis result for SHA-256 972f8da364f31844…

MALICIOUS

PDF

82.1 KB Created: 2021-10-07 00:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99f3c14872861f19cf7a41afc268485a SHA-1: 439b326a4fc12beffa391d3920cc328f38e0e0b4 SHA-256: 972f8da364f318444b77b5416943038059c878b115a817400904ba8de299b76e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+eat+fried+worms+free+movie
    • http://kaizenlife.com/ckfinder/userfiles/files/75185156123.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rmk25lfjcd0tnjk76219dum64l/83147413498.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/57o2fchqnmua9kcs824jq1071n/28135221689.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/gufifadofin.pdf
    • http://nktrading.qa/file/files/vuragiwaz.pdf
    • http://energy-labels.nl/userfiles/file/tikevefofikux.pdf
    • http://njchemland.com/upload/files/doxujusuzolaxeposiv.pdf
    • https://hoavily.com/uploads/files/61512047669.pdf
    • http://snuhonors.com/userfiles/file/lebevozudanisufeneniba.pdf
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/fasufekituba.pdf
    • http://vanlysecurity.vn/vanly/album/files/saralapusafinudiwoxubizu.pdf
    • http://www.alfapilates.pl/upload/file/71408123211.pdf
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/tirafi.pdf
    • https://apelhijau.com/contents/files/92498627655.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/42757452135.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/61143724413.pdf
    • http://fotosvatba.net/userfiles/file/zejilajan.pdf
    • http://hydrem.ru/images/file/62211517106.pdf
    • http://www.examnotice.in/uploads/files/272362991.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6427899efcb29020ca07bfbc87971288/sidoxufegukufa.pdf
    • http://avvocatogiuliani.it/userfiles/files/vapupevaleguvokaj.pdf
    • 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_off0000d7a0.bin
74c7e844a1d772cb38ed012d7f9076e2df6687b36d20a09e070b6854b5a083fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 10508 bytes
font_01_sfnt_off0000ef9c.bin
3947bcc9784ac8fb44fd9108698486d15cfcd169dedacfd7ce792f221086c568		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 19228 bytes
font_02_sfnt_off000122b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16792 bytes

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