Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51bb217f1b9f8e8…

MALICIOUS

PDF

97.6 KB Created: 2021-07-01 11:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2716340e768bd312b3a42a72bcbafa7e SHA-1: c49fb2cf656154cabd596101d53d5822cf77c0c7 SHA-256: e51bb217f1b9f8e8efeb1df7e2582173d0378e868b1532486a3e4adfee670930
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The presence of numerous links on compromised CMS uploads suggests a coordinated effort to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://xn--d1achljw0b.xn--p1ai/content/upload/dekara.pdf In PDF document text
    • https://arichaindia.com/userfiles/file/37747126582.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/jopevageg.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160945de2bd4f8---64575279541.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/49441286247.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff8c36292---zidaj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf39126225---xuvisakegolawixerudedavu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c3f50ceba99484b6bf50424558344703/foxedazi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9cfec54a---visadovipabogoxinubomuwe.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080e91135678---bebisadu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d1a425614d---xumadedupugufogi.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/69256558330.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/71625280813.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160978aab0757d---tusozegajiraremusebeg.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/wovapobaxumezopoju.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/28399474292.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/72387076556.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b741a572744---fufoxanakaziborikobo.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021062315004755.pdfIn PDF document text
    • https://majubesar.info/contents//files/togakokononuzabeponoxipak.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210619234703.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b075890e0d2cc3dca0662fdc1530f88c/wixubisinal.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/tefuvibag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=theraja+electrical+technology+pdf+free+downloadPDF 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_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 11024 bytes
SHA-256: 63f11d81982cf34d61adff3f7b333dc66ead4cefa9fedbf4fbf1ed71c7c2b8bf
font_01_sfnt_off0001311a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001492c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492C 18080 bytes
SHA-256: 8c8e173f3daae5a2dcb772f0601e2a430de6270e3ec78c729b97d2642811fef2

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