Malicious PDF — malware analysis report

Static analysis result for SHA-256 a265c7549d45b8ca…

MALICIOUS

PDF

92.8 KB Created: 2021-08-19 19:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d4885f8919078081b542eab5335d246 SHA-1: d91b73adb120062d0b351f80f5dcc3906f49bf40 SHA-256: a265c7549d45b8ca0972af60e4557cf17e00255e25490de384212775986a4156
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.aqsclimited.com/EditorImages/file/37353786274.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f6cb69b32---revobureniv.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/mikegilimowag.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc071b6ec---87497545589.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdc289416---zefigujumuluxufuj.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/jexur.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vujodaxejoxufobe.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71d1bf0b5---5427921814.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1b09d42282fdad7ebde3f3b7760dc17e/47781636043.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f6dcba8936bb4d5492d11a9a49c6354/20021817873.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/lakifatazugipolawagubiz.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f2cb1df2373---lezezoloribikokixido.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/jonimiwulujuse.pdfIn PDF document text
    • http://caramelitos.sk/files/73876238607.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b43cb452---94563657850.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/getalogijefijolup.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0d392014---kerebavuxezavow.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/83579263799.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/3152619355.pdfIn PDF document text
    • http://torgoborud.org/images/file/mimisusad.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/43569141290.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57802d5d17---12333379399.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d0a37c87---52095430986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cerita+silat+kho+ping+hoo+pendekar+budimanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 11204 bytes
SHA-256: 31a1a8919dc964920f5225dcc2d7ed03add42b6c8803f2c6dd40412f54cc49f1
font_01_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 9900 bytes
SHA-256: 55b381818c378769c6d7ba74b4ae9a86c3988ee749300cddfe55a0a2a7deecd4
font_02_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FF 17160 bytes
SHA-256: 969ee04cf425f658d8de4fece62f487198976c7b2f76aa70755e28b9516ede64

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