Malicious PDF — malware analysis report

Static analysis result for SHA-256 0648efc29b3e437e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 08:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8648cf2ce2418745d2bd6ca5fb15626a SHA-1: a636095a499ec1b38f75e68f034ae6cbbc66e89a SHA-256: 0648efc29b3e437e223e5a49a2617c3952a15316d3fb088d3d71ad8e7040a375
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The malformed stream length also points to exploit activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/483957ccf94732469aca1e44089a6715/59217084997.pdf In PDF document text
    • http://lookkorea.net/userfiles/file/votajeror.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/50882187153.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fozibemigapegejaxo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cba03c7eb44f232fcbea404af738cd8a/zariloradolajik.pdfIn PDF document text
    • https://euchebnici.com/img/file/sumijobikaliper.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/27d674007d986b2aeb0d66106f3c49f0/67660599059.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/tobizefonul.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/vujuzavukisisiduvig.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/57502729849.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ea5479713835e0dd94a81f4e4352d57f/92140881803.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/kiralor.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ll1sd9ca7eb5aogg0atqugpkpd/77151445731.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/puqfede9asoie3lnolabahngnc/dolepibuzodebizaxusu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/59049124368.pdfIn PDF document text
    • http://robbes.nl/media/files/zazubaxuxusujebibuxodibe.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pv88m19h800upk7fjt81pnvgu/vevijufodopigebamubupa.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65dd4111f0---fonefur.pdfIn PDF document text
    • http://119pump.net/d/files/xivoxuzexona.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/19368819368.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4dbe5ca07---81430919920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=transitive+and+intransitive+verbs+direct+and+indirect+objectsPDF 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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 17964 bytes
SHA-256: 93a11693cae8741149b6f9556f5bced39d80598b50b6ecad8c7112c3fbfa7c33
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 10616 bytes
SHA-256: 6f26be063a7b7f9301dd456b86c29143797297ef4be0695fa7b4116154623628

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