Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5851314ff3b953…

MALICIOUS

PDF

95.1 KB Created: 2021-09-07 17:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd383b902ec7745cf388cd2cbf7d21c6 SHA-1: 15e6b3683277c04e32b020ceb5690057244c7777 SHA-256: fe5851314ff3b95316b72de5eb20292b6f7f20055492d5e9ff5a1f2cc28dd814
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS uploads suggests an attempt to obscure the true destination and evade detection.

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://vizugy.hu/uploads/files/fakuputesekimeredi.pdf In PDF document text
    • http://rund-sro.cz/UserFiles/File/27669258773.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/62115346345.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/togiv.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bomikikegigomibabuxomuji.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/76b59d0b4ad1e8c89a43f5c5f84912ea/84731462244.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797aabd3a0d---42767847441.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/6464980381.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/watusenowodekaled.pdfIn PDF document text
    • http://mosjob.ru/images/file/32472584215.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109031816189313.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607688b7dfe1d---14530074907.pdfIn PDF document text
    • https://avenue102.com/uploads/file/gipokom.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/kamirijab.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/e5j04o8o322d3voqi7g4egc0un/vigovovaxajajudivip.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/73059276214.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/mimekowone.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dodemddiu1u5kqipjcoi0fitnf/figogowelupenaxatut.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210628033544_276cpa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9d410c5284b13902215492fd573bd72b/ribux.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/72758086584.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/95685344060.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/61348019938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dustbin+baby+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 10448 bytes
SHA-256: 11310565fb628aa03972c90b339ba181a70d7e7307110eace08fd8d8b6627f16
font_01_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 17652 bytes
SHA-256: 34d2ddab3f41d724982bca04c1693621819351e8fa9cd524f0e3cdfbb29ab8a6
font_02_sfnt_off00015708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1