Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ba5f087f772a3c…

MALICIOUS

PDF

94.5 KB Created: 2021-09-20 13:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba7a81a6b41d36d391754d771b232a4d SHA-1: f24f05dce3d5abccae1e1bde9e85244dae75b4f5 SHA-256: 88ba5f087f772a3c12a6a1c7b19134d78db1932f70b289a9108ff2cd8d2a3a0f
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a 'LOLBin token sequence' further supports the attack pattern of directing users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://pistant.ru/uplcv?utm_term=osu+droid+on+ios PDF link annotation
    • http://robwalker.net/fckupload/file/nitowakuf.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/56331211390.pdfIn PDF document text
    • https://avela.md/userfiles/file/30437980654.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/9593418492.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/4668017035.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/gibodamij.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/labalifikisubiwarinugimep.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/28abcb6dfe68778931314807157024a7/77232627191.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/72857183146.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/zitewexojima.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c7def9b4---poguralamotufodide.pdfIn PDF document text
    • https://harom.ro/files/file/nonaximetudaxuz.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1880bb596b166bc8cf95a06afca6e750/82784485739.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/84431686760.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/32929814076.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a1a56e1---46833229609.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/847674159.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/14316383574.pdfIn PDF document text
    • https://atiksigorta.com/files/28778637710.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/solowipagupi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613082df551f4---gavomirifisisopaket.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/33942418743.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-19/20210919110456291219.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/15781010241.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33938272189.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/sogamolatorugafubu.pdfIn PDF document text
    • https://jamiatulbanatIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 24452 bytes
SHA-256: f2cde4614539dd4a104467d6da6e20b804586b6a589be009ca41bb15bcc1c453
font_01_sfnt_off00013e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15678 9928 bytes
SHA-256: a5b9b3f3dfd1a9f79a752f3dc002ef86021f4f672d5587e66293d1e395960096

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