Malicious PDF — malware analysis report

Static analysis result for SHA-256 e152c7d4be599dff…

MALICIOUS

PDF

88.3 KB Created: 2021-08-19 10:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 569ba8b727ec97f08969ee85723eb72d SHA-1: 66273c6603d73edb959825b2109f3566adb497d8 SHA-256: e152c7d4be599dff0b73b4636be8aabe137b4aa2d62b42bf584e24ba0ce59220
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=mp3+juice+cc+download+apk PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d3149e27becbc5d150f75bfe7957708f/mevarojaveto.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/37712840186.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf6a4c97a2---9096456780.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/winofopodoma.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad213e793---lomiteliwa.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c381925dcd4f2d4c2e59bc3ce190721d/bezaguwex.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/54841199360.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/59700013919.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f0f535bc6b963c1531d4e009b3459faa/wowupasu.pdfIn PDF document text
    • http://babamoleskine.com/files/file/44126861575.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a27f134a7---22734453232.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/42624574862.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/gunexurej.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/tiragaxebexavudirokurob.pdfIn macro / runtime command snippet
    • http://suankaew.net/upload/userfile/files/94218835892.pdfIn macro / runtime command snippet
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/15142566971.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/dekufapuxo.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/gekiwadevuvamivuz.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xokuvewegofedulaseted.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/bizodozosakivug.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/forusunam.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/cf9b9fdfe64534c7544cb2ef7cf82679/sezejunerukuferoz.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb669742fea---620011560.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076929521a32---wotudegif.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/rebopodavopisixeturo.pdfIn PDF document text
    • http://artpolinakuzinaIn macro / runtime command snippet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 17688 bytes
SHA-256: 576055d049e108e8ea7ac1a4ba547577654c685052ab99d10b4e11262e5f6370
font_01_sfnt_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 10712 bytes
SHA-256: 0b706d1051bd0ccbd6c784707135fe07c5934510931a8f6faa774cc79a30c81f
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D02 16224 bytes
SHA-256: 749d0e0a2ebbce6e3a842727ccefc785b5fde86fcdd6c62922dcb2c91ea58cfb

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