Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bb7c408678d5e1…

MALICIOUS

PDF

103.9 KB Created: 2021-09-22 23:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f2bc26bdb1f7812eed771bb673a0d9a0 SHA-1: 53effd7df0b5da41ca838fa998a173d42fd183bf SHA-256: a0bb7c408678d5e18ef61b43876ede884ae1da906e0b066163be098bf428a133
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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 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://genegurumiraclehealer.com/userfiles/file/95667021803.pdf In PDF document text
    • https://4wheelchile.cl/admin/uploads/file/gekinijeveligigupox.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/37802643662.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/07044715393.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091217020673499.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/xozawekuxivavajinixax.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/34500434311.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/zagetopaf.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/wukibif.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/numanutes.pdfIn PDF document text
    • http://kite-surf.sk/files/potafunizovitoguligutok.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/66660455987.pdfIn PDF document text
    • https://birotex.rs/images/files/36247971515.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/75773124631.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e5d97692---kefowimozekunifixetug.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134f46e73733---ruxebabigasijo.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/9626619120.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-21/images/files/saroxafabibun.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904201649.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/37517397231.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56dca0cc1---xotutazepamaritaxevudomib.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/db50ea2ae4c3431052827d0860b263dc/86552845858.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/xefematiwifuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=warhammer+40k+1st+edition+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_off00012f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001474b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474B 18840 bytes
SHA-256: 6ca488027fc82f78aa9874024401199c63ed37baeb9ad58b5a54a21701786ac3
font_02_sfnt_off00017849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17849 11056 bytes
SHA-256: 8178947e9f5348b194f0de8d6711ca6e049cc6d1a9af670c25c181bf67701be1