Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e6539b874eb69e…

MALICIOUS

PDF

86.6 KB Created: 2021-07-10 03:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a86920bef980d869fe162e3a934a17a SHA-1: 9ddebbebae0940215c0547c409a88c318acf133d SHA-256: 32e6539b874eb69ef68f799c87b22bf22d365a5ee9e19a88cf3d748993bd4f73
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the compromised CMS upload links strongly suggest this PDF is used to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/iaslv6pqk249u7dkp4l0revsd4/zakobumaga.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d0506114---20810597785.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/98543182757.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/kisarusupopefapikiv.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/197ead16f713eedd81e928c1a4249c39/89686951908.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607291d76c18a---kabezuruzifokezafiso.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/kowuxifojezitokani.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/u1ikqhab9a9tbb7f1e4cvlnmre/77868568881.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/puzixivirizi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f3cb718df8708afd2a160884da27ff0a/40073487140.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1525413e73a2db18101fbfbeabeee1aa/89458795315.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fc7a7bfac832fa46c7698d38eb6522d6/65582665312.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3f861be63b340fc405d953cd69fde788/pobabokurutej.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c6f2c6d9baf4fbe049462e540daa60a8/lifesa.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087741206740---medumusidu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/o092k7u7t2o9rd5qmhd3shaddk/xedosudajiku.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numolanopetutesamafu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/34045929411.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/81476167885.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc94553a73d---81696798734.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a233ce0d7dd---59750988196.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210623_211054.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/8090115184.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/23876773903.pdfIn PDF document text
    • https://windsbs.biz/files/file/42366649980.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2o1inm35a42gukqkgd7lom4sc3/49828896032.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/65299843745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nociceptive+pain+examplesPDF link annotation
    • https://medlineplus.gov/pain.htmlIn 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_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 16256 bytes
SHA-256: 3151d4439374f0f15a7c9171d19656b59a3cc3db0e6ebf180e1327abab92a408
font_01_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 10580 bytes
SHA-256: 5c7b9d599595793c0611d1fa56577c2bd10506102ed882490af7db604c248082

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