Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5655e69d4536382…

MALICIOUS

PDF

90.5 KB Created: 2021-09-20 05:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75d22874c6dcc0be06f8cad04bfe2f08 SHA-1: d797100651ca646c15effdd30798d281a6f3ad48 SHA-256: b5655e69d45363822659fc1159c3e7eefa4981cb3624ade46c8c3e287a2cad86
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user interactions, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://wastran.ru/uplcv?utm_term=cara+setting+sms+center+di+android PDF link annotation
    • http://jinyezi.cn/upload/27408596678.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161323244a4cca---wetadosimozobum.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/93691088066.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/milumodef.pdfIn PDF document text
    • https://kaimano.it/file/ritew.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/1d1c4f0861fadae65f12cdc40be32f00.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/49345344817.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614506a144bf5---97726181504.pdfIn PDF document text
    • http://tulga.ru/editor/files/mujuxe.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/bitixepekexizodizaw.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/91133189006.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/jevojuwemofamafojubiwan.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/nuvufanotonebomo.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/tasagupomozuvafepon.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1tjvup7ksf81avckbtvcvadjb1/femogavuwusasebolawawado.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/gumitivo.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-19/20210919060237399320.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/88036310153.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/kulosa.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/livosisekemu.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/jutuzan.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/zedonizivinoleno.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/38387211010.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 10696 bytes
SHA-256: b3aaebb304d4f81a0a115383cf06c3f46640872d12865bf434f8a0d4d5c9de96
font_02_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 23752 bytes
SHA-256: 6eeaa5b620ff70be0e86c29f25bdea179a5125ace14626bcae158310530610f4
font_04_sfnt_off00014619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14619 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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