Malicious PDF — malware analysis report

Static analysis result for SHA-256 9153877a6fd8ee2c…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 10:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 43d1b8aa0b7272c86786fa957a4a098a SHA-1: e2116d66e2e7adc1cee68da98998fbc9e175dcb0 SHA-256: 9153877a6fd8ee2cd54dd5c54dff6ab585dc8c1082eb675d9717388c62818f06
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://synerhu.ru/uplcv?utm_term=section+12.3+gathering+weather+data+worksheet+answers PDF link annotation
    • https://hotelmitrutarija.com/uploaded/files/mebuwokitelufuregune.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/75906464686.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/waxoj.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a981829c21---94611357032.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/268p1h2i1eh652eaou8j6c36qt/safimevutozujikobolaguji.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/diwiwamum.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/duwikudiririlasitepunulu.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/gewuniberaren.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/690198385.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/beaee3eb8e36b0217287beb95329b10f/59770739108.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/kawedenetupemusovom.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/57217668610.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///pixamekazasuni.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9e893621---tapugewidunolex.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076bfec90204---banusedeniwemaxibojafizir.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609882be06fb5---85863085006.pdfIn PDF document text
    • https://tcremich.lu/files/files/kegoxov.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/12131199473.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516003321156197.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/43961400395.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/88989220451.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/pimejumifod.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/98666112006.pdfIn PDF document text
    • 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_off0000bec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC3 16632 bytes
SHA-256: 9a135d97122bfa9cf2bc0b9c4a3422317e94c21a221de7660f1633e811e7e80f
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 11264 bytes
SHA-256: 83697942f9331b318c60c91d4c83f92625465f499cac5ac7619ca073a99c978d

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