Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7d1d26b8e3c5cd…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 06:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3104b488d0dfb8e575e04313394b5106 SHA-1: 056439cb922244f99347d005ab4b5971b1cb790d SHA-256: 4f7d1d26b8e3c5cdc031b602ac03f495b80884cfdc48037fe1ddd43b7f9183e9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this, as these are often used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4266c82cb06303c770cf51b16452b1b4/rigukapu.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143be44bfc44---28738145386.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/76546717518.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62731ecffbd86ddbd4ea437c0ec35558/14861083559.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/35560615829.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/43370042210.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/rivewikakofevobi.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/67616309691.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zagegekokakapineki.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/risetafex.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/72126081112.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/8448297839.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109131731417206.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/xupimibejefakebipagulego.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3b31882302514eb0130529cdaaabcaa7/vavonugibonojofumo.pdfIn PDF document text
    • http://tlznailspa.com/media/files/80609759926.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/48519003355.pdfIn PDF document text
    • https://dalba.net/other_files/File/29368688118.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zugalavarawixofovidemo.pdfIn PDF document text
    • https://istanajp.com/contents/files/wotijijuzakibowuga.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/89170065009.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/46603446352.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f5c6c628---94988851265.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308ab221a81---97249024630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=facetime+para+android+apkPDF 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_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 17536 bytes
SHA-256: e02db617fcd8df6bb0b486e4a6f94d58796fbe0829f175e31dd73f531cad9690
font_01_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 10528 bytes
SHA-256: 864b1a6caa92130268c25088625a2733616e15bf8b357b0444b1ea5dad8b0188
font_02_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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