Malicious PDF — malware analysis report

Static analysis result for SHA-256 b649096dc73af852…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 04:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 158375d0b03cbfee5df821fe5139c21f SHA-1: 5aed0d7196b065592782f5c4964cbbf3f4d4a773 SHA-256: b649096dc73af852ab67feb1ab5af9d67b92108ec613bbde0a5d45ccfe6e3f81
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'cmd.com' in the document text hints at potential command execution, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • 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 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7a7d8046710b12b16efcacc898696c6a/kugoxiruzunijifotalag.pdf In PDF document text
    • http://op-gold.com/ck_image/files/roxilab.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/52726573763.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/54826173367.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8ce60661---64997249000.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/56915359160.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/vafipuposa.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/zugegepo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144457098e7c---tapevokojusobipo.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/33734396274.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/koluvobanijas.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/66568364536.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141b61063a3b---10293552036.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/7bvqn8brq3m125tol7mhkq3v7q/wididumup.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/78574103621.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/91367506207.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/58490990083.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/valipokesasomes.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/xajopewadavuxedaresafa.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/nonajemuxobiki.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/7726981968.pdfIn PDF document text
    • http://qdcmd.com/data/files/xuzuxolameke.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/20654589260.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/lujalaleriledesopi.pdfIn macro / runtime command snippet
    • http://lamekatus.ee/uploads/ckeditor/files/rarotupotamunojawowininef.pdfIn PDF document text
    • http://malir-naterac.infIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=thomas+piketty+capital+and+ideology+pdfPDF 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_off0000b55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 15732 bytes
SHA-256: eac19e7b7151cf910003ee0db1d3a7cc206d1da2c8caa04fa15f0e5c48a4604e
font_02_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 11136 bytes
SHA-256: 789bba69519b8f9c2dcc594939052182a6fde4b437960fb30f71b32f12f75a05

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