Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d80770ceff01b52…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 04:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd8dc1bee5b6798b4abf1f563479ddbb SHA-1: b2b1c272c9b41fee2e1ff466eb5afe504d0fd6b6 SHA-256: 7d80770ceff01b52d78d4a8b55f936d92f16fd9a15ede1179880cfbe97032fc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised websites, likely as part of a link farm to improve SEO for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=programmable+logic+controllers+hardware+and+programming+4th+edition+pdf PDF link annotation
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16080531aec35d---35919316270.pdfIn PDF document text
    • https://egf.tw/test2/images/file/jogufowaxezi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85b643d45---763355003.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef10be308---93123442923.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/54ffa2d7b7792e25ead6845949fec270/38146168661.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608fccac7670c---varuzenojis.pdfIn PDF document text
    • https://bamor.org/userfiles/file/visofivoribupokuzivolej.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/96000008759.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f1ed0396---33800383303.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6l79f4611aaiqedneudv4bcri2/togopasemipe.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/wakubew.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79300669145.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/23614542114.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/98922ef387e220c0b4fadf2fde574ed5/63812890958.pdfIn PDF document text
    • http://ha-sine.com/d/files/42989288665.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/57788013442.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865af7e8a52---kevopud.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051807444369.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/3896713756.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/gorut.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/19703080256.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/jagedilitagaradosaguxafo.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/tesafoxinulewi.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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 17064 bytes
SHA-256: dc49519bf2314718b65e9bfa59f118c49cfa43e820ce9df3b153b3a38bb3ce51
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 11372 bytes
SHA-256: d70fee70229c86964fc566e7da1d8f758c5926031ac7e606f8d9af8d3f2eea45
font_02_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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