Malicious PDF — malware analysis report

Static analysis result for SHA-256 661add83d005b00e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 03:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6be2f6c996cc3c0e7a7481d56da196d SHA-1: 1cdf84da2f546ad5071123b6317a17db891b7c1c SHA-256: 661add83d005b00ed3e292a3a1c51b7bdd172c18f9099e54c2ea887b23a3fd26
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external resources, many hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common tactic for executing downloaded payloads. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://allytemp.ru/uplcv?utm_term=get+out+movie+download+torrent PDF link annotation
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/6ee5cd5724b37b73cd4cedd34e68d5cb/54216951944.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161408f47dbf3c---nibudaj.pdfIn PDF document text
    • https://cecprint.com/images/file/dofesorenejulopuveseni.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/5289890704.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/mejewemegake.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614764192f455---42300713195.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/fekimejanizugaleboto.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rexibivuj.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/vakoferelimofaminez.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161443d3a1f7ee---zagasiginijexeguzilu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfdc8d8234---xuwomur.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1c6abba7---20956340124.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021922246422339.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/fuwebilelikusomanun.pdfIn PDF document text
    • https://rippa.pt/files/file/mivuzaderorug.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/numet.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/50466695089.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/malopasumofusibiwataduzuj.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/19590276468.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/xopolajodubivofovudazuv.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/derawe.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/65414306433.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/solofubi.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/xutilatakojaxafizos.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/vufixoruxukawoxuzogisu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab5df33b58---73515629031.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8183d17d---sagegefusovaluwisuwisi.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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 17976 bytes
SHA-256: 6ec9cdc45c440e209dde45a4be85397fd704327fcc196866a59326512f0cbf56
font_01_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001271e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271E 10532 bytes
SHA-256: f61f936c1901345f447bab61a79dbc2bab08717ffa6485a0833578f36ee41254

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