Malicious PDF — malware analysis report

Static analysis result for SHA-256 61189d8eddac271f…

MALICIOUS

PDF

97.1 KB Created: 2021-07-09 10:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a7e9083acde6257b100aeb0d4fa22a9a SHA-1: 5448bc2db4a495e823b510fffaf150ddd44243d4 SHA-256: 61189d8eddac271f416115f8b6c19f82e3202ae2cf94a5cda8d21daccef79f98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0f7004d7b8cc1d3f4bd282fbed17ca5b/noguw.pdf In PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/90667770029.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/91576358866.pdfIn PDF document text
    • https://mattress-leader.com/media/kavixuresokogigusedofar.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fmameb45q68ri6tr9e5p91035c/72349317503.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/66398320540.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/snvh5hcu6i97j5j0k5lk00cvpc/95290709028.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jarebibejo.pdfIn PDF document text
    • http://poorclarescork.ie/images/52030268017.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/2h1jorric2n7ku38ft26lnltl3/55920894644.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/guwejidizomosejubum.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608640b6dfa07---woluxazuvijoxewabare.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/sewifen.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c3253a141b567804b32ed5b5aa1eeca3/11560757751.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075b516df720---93266874356.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/577362795cafae5c07d6bb65850b9924/24789011539.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608427d2216bc---juzagojarasujopi.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/zenefokuguvetefafegi.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/28549737864.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9b43fa240f93932772d8d27401951ed9/vujukekawikagupelixefasus.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1f7951399994e2214572158f931ec92c/96025963734.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/bolumuwevenuwinupotixelu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609d143d700e4---gusunirakokilebuvolafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+whereofPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011b79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11B79 18912 bytes
SHA-256: 6b8c6e60cad053a6b3ad93f8470062becc6835797f3a797da531764ec705a8d7
font_00_sfnt_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 10260 bytes
SHA-256: 75f47550fbed924f2daca27f319bf97d941e05d327ea9ee82fe9ada9347755fd
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 4640 bytes
SHA-256: 673d6c0ca1e15a6456434d106c0ea531c9c6001effea9d304f2e86e1cbb3a392
font_04_sfnt_off00013b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B19 24432 bytes
SHA-256: 60a4e33a4275c93b488f0ae52c722b899166029128b20e21a2e89348899448fd

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