Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa46a28d4fe371d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 18:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb5b086b5b6f2eeb353cede214d59648 SHA-1: 8c3da8e1463e77cf32905f30e6b4a118f880fb4e SHA-256: aaa46a28d4fe371deeac9cb8ed24b3dac5995550da674b1a4219057951e61c8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://amdind.com/userfiles/file/paxozaduf.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7tkd1mmk2cdmbi511uu9uliumo/gowokejonidaladiwex.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8abdb7115e2bc20a0b9dc37ec8b06624/vejususopemor.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/pamavemenizuwi.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/29357468206.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/5e88acq3ll5qt87nobd9ek7ug2/dofivarirarudugixavo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/33002e1ce616f3cf368b7eaaf9aa58ef/jonubopi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608726c2a363d---botifupafixebumizaj.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/5743258219.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210730034459551.pdfIn PDF document text
    • http://patroha.hu/file/bivatogasi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/463052953.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16102d24d595bf---48081098832.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83086ac2d---91094312528.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5aa125b9---9226397771.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/66066213120.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/37536481694.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/zomedimimufu.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/regozifoludiponuxevesus.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jokowomugatoxofexodebava.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/60367910631.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/mozadisafon.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/fugokofiken.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/14675224053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=synonyms+for+up+close+and+personalPDF 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_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 17144 bytes
SHA-256: fb2fab56cb5cfc36394c5b487bbf168093c13b046346ca2b1a864237a6ff76c4
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 10880 bytes
SHA-256: 306fa6851d1467ecbd3ce6f2b72b36322a24065847271a912f660e0ce0b174f4
font_02_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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