Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bde082d2cbb799d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 13:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcbd4fdab0c433a19d51a3d8e9dc63d6 SHA-1: 34da665475dd5ae1a9cb94869532004a3a4d7636 SHA-256: 9bde082d2cbb799d6770ea58b0d01e6dfb9840695fa86b13781a5b9a4f26f9a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dietgame.net/admin/fckeditor/data/file/20210817175919.pdf In PDF document text
    • http://metall-press.ru/files/dupidefunobax.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6ba93a1104473e6b025057dbbd4a1e66/gifata.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609606546a9b5---99975719518.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160821481cefe0---82813591215.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210803011347.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d705c6f1---rufofitotogolikenodoloz.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qa6nhre6eg6ugo7nnlcfg60b3t/sexasurubara.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hr1kjaprd5e68pudvirekui5sm/54980173832.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1135eaba937cb894c9a2e6483936c391/bagaxerorawuwom.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9e4ca68bc8698d336d907106e4b3355c/zupufunezalexog.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5cc9a076---nopuzonivubasowakemof.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210826_D17F2B76B339946D.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/55451662372.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/27468310720.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/tajodatixoremekoviva.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/l8j1delfvdnf9mlqqjj9pfjlj1/wubag.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/baf8ea5b80012cdb8a4e24b673b77b28/tobasenovugupa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2740e5b6ca---37043414650.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/rizukakozepem.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/73641520612.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e9c773ba---bufavusowojexaredamiv.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/99532180049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fellowes+cosmic+2+a4+laminator+manualPDF 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_off0000c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC780 10752 bytes
SHA-256: b39c5eadfcb3c15f2e54bdb92fb2c1025e6453d0311526fc6c6ba937e3b7e1bb
font_01_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 17284 bytes
SHA-256: 224e6c3825f5d5a5b782db9029cfd891c976079618aa2be27965d5c9ec15f170

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