Malicious PDF — malware analysis report

Static analysis result for SHA-256 3920454f0e60c873…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 00:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1ba0bc4addbbc12ed082960a89e4592 SHA-1: 339ea87f476c9316daeb853999fa5613e2f20076 SHA-256: 3920454f0e60c873dea88ffb9656de757d981f49888ce6e818be0cda638c1668
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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----8sbaqfskngn1qi.xn--p1ai/userfiles/file/23172961720.pdf In PDF document text
    • http://tc-antey.ru/uploads/files/mojomul.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/rimogizibakejiru.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d42069e39---47171211798.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ad281e97da500c6d2c580d0ad53347f2/wedogobupun.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/12518605772.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/35875555879.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/59198538842.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/fccca1e144a6201156359472b6f892f6/jokozomiribodu.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/nipiximusisokiwu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/92953862812.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/58234543272.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/78483080786.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/48842946065.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/28332234896.pdfIn PDF document text
    • https://scriptdd.com/_file/file/wopixu.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jekijemonisedukulomipisu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608484f470242---lapokemivizezimutepejali.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/631fdc6cc74b91cbf12ef002130d86fe/nubupenikazizapi.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/8602611700.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/16fae073fed9f922fcb8e76f090eaa34/lususivapixefidivenigax.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/81538587795.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/42281501588.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qd5ipq9c8ucuggap9nsncv21f7/beseko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=radical+behaviorism+pdfPDF 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_off0000b80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 18512 bytes
SHA-256: eace04f48ee88e17d9ee2af4159266be88274e473a037290fc0cc89f7d675c34
font_02_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 10936 bytes
SHA-256: 6701a75dd4f7292718e03715708cda8b75f08b5c590cd2ceea16842255b7d7cd
font_03_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 16688 bytes
SHA-256: ab732154cbf7abd76bd21c2dd201288a1a6159f4f099ee84f4a02df296b043fd

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