Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d7b9d930459a9f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 10:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f190ecb86b4b393f4977c88484010f04 SHA-1: 9b6c30e648b8e1a65321b80066fb9fed04929164 SHA-256: 84d7b9d930459a9fd98be921033adc769b94824c51260a3e76d579e5afb65a0d
156 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. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS platforms and disposable domains. These links likely serve to redirect users to malicious content or phishing sites, aligning with the 'Phishing.Trojan' classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/65963f2466618bfc18b8bb88e1c103f7/jolerusazurulemunajuke.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/76a1d8a6f2e18ac5f90e615108a4384c/36222588426.pdfIn PDF document text
    • https://rinducm1.com/contents//files/6215681951.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bbf841c6c488de21d4d49b3c4adbdbf3/8212484707.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082e222600c5---10373005623.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/2260f02dc6e6f0da9184cc5b428fc03a/63197937653.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c9a9328681e7d318b701fc0ce063d9c0/70946571254.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/dufoboxug.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/xatubizuzerabuxugimoge.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tebesepojuwot.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/59559293389.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/25029266891.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/tafoketenoredejemafoxe.pdfIn PDF document text
    • https://brod-plovdiv.com/images/tetujufujut.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/similevifonovanejajiku.pdfIn PDF document text
    • http://gojjang.com/uploads/files/mogosefubifexow.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/terigofapasekilisaxifa.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bb29640ad1d78191df78886ce2559d44/wegilarowizomezuvivomejes.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/31938112890.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc32009fc2---38223479871.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf40dbc3f---gurulunefaferebedomam.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083375d87aef---berif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vulcanismo+y+sismicidad+en+mexico+pdfPDF 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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 10868 bytes
SHA-256: 75a764ddf2692c7e20d6f22ebdbeb088a0328d2e01dcd56e85baaeb9727a04fe
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 20688 bytes
SHA-256: 37b69a11a45b050855518549da9f8b5a6c9769232086db22272158d3d768b783
font_02_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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