Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2fb4d4382450b0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 03:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e5919672fa6f129e73c4917c4253f87 SHA-1: 3cc0c544809e0d0065ded57b2084a99142656b80 SHA-256: af2fb4d4382450b0bbf75c06c8e640881cff688bad61ac4056b2d07b9d8b260b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://coretry.ru/uplcv?utm_term=exercices+corrig%C3%A9s+sur+les+asymptotes+pdf PDF link annotation
    • http://aodaibooking.com/FileData/ckfinder/files/20210531_A0AC5EF5E5F4A17A.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/zuzilupijadogabanumaxoxet.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/jumataterowemiref.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc95eb0660c---podepuxati.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vuwemige.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7432ed016659129018a37b528b18a93c/75139673375.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/pekatexexima.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/006b544df1819a1e3017d470b7e47ff9/26353757842.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1855781db---xovik.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/80589298998.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/53460948775.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210803091217.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/5aed6ad08d4bec8a9769cb9d2242df76/tagamit.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/wivubufovozejokopabupejub.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/regozakesu.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/pasoxumozojepep.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609878988246b---refuvawaxopawajuvim.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2fbb759058ea26987fc35f4b942cad83/venorakabonaperitibafej.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tonigewus.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/40670181030.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160909cf04a8c3---18004122456.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cbed5f5ed---rafezoraxo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62ca2fbee---19141471662.pdfIn PDF document text
    • 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_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 11312 bytes
SHA-256: e3a32e1e1d8f22dee12f5f859eeab5b2be9879e38d4cc996fd28c9522687f535
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 20080 bytes
SHA-256: ea627e798af284a70f4cb00099c67d09962bb3d0eedf081ecfe23692cb1748c7

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