Malicious PDF — malware analysis report

Static analysis result for SHA-256 1244f9ba2a110170…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 09:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 512039d9ef1f1ca262dae1b0acacde28 SHA-1: 0e6ca903cdc294431f70092959990c5ac5b15a96 SHA-256: 1244f9ba2a11017063d9a0ee97b6a375c6b58e68a1c4ecaf0d7ac82c07f59b80
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the heuristic 'SE_LOLBIN_RUN_COMMAND' suggest an attempt to exploit user interaction to download or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://synfarm.com/upload/files/75215578927.pdf In PDF document text
    • http://puebloexec.com/userfiles/file/zixunapole.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/wuwul.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/75111711534.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/42253828749.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f47b698d7---dowifejatugewobijodiji.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/feveramemewu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614145905dcc2---ladiruwajezako.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b99a85d2---bonulavav.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/8363621187.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rewedefo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ee555u5hhkdq6hnu1s9c2qk4d3/zukuro.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/77751738800.pdfIn PDF document text
    • http://888chji.com/userfiles/files/76009981282.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/xuxixebu.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/wozutumolovivaser.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161325549dba5b---rogupu.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/26830146998.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/72659188112.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/sagika.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091408064973499.pdfIn macro / runtime command snippet
    • http://aci-immobilier-douai.fr/userfiles/files/lezuxabikasapis.pdfIn PDF document text
    • http://hometextiles-conIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+put+a+tiktok+as+your+lock+screenPDF 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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 17636 bytes
SHA-256: c437e80a545e4e27404d3b0c51fb8be6d92bdc6a8e375868986bd0b28ad131d6
font_01_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 10752 bytes
SHA-256: e9523883d202ebac4235431ecced1c25b1bfe6287f5ec8df52dd895399e04b33

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