Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f11816cb8c2128…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 13:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7855c29351d4dad7bc88dfff191566b SHA-1: 397874ebc5a3b12ae3fef32df43e052ad1b222f1 SHA-256: 24f11816cb8c21286ab9c9f6a958af92a198516060a36cc37087ee84f797edfd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing scams or malware downloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s1ea4tqgh09k329lt7ovq96ipg/76378747333.pdf In PDF document text
    • https://cmfnepal.org/userfiles/files/zurika.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e024d865---69873863704.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nifaj.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/39839945525.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/tiluwobima.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160813112013b3---36822842702.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/zobenovozurukunigupegun.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/t5v4aqrf3tilag9mpkpqiiupva/3900505440.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/79459290300.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6d60bbe4---fowupowibevesam.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/mokorusadi.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b40ec9e6f532106d5d2f95da19cca08e/62562244243.pdfIn PDF document text
    • http://katachizu.com/img/news/files/34543585320.pdfIn PDF document text
    • https://aneri12.cz/res/file/5603786075.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612cab084d831---26054375447.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/01c37e6fc4ab013b013abdb65c857a07/nuginidutiferozegerep.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/61ae882c4661c51e905a71e8792d1a8a/14130437823.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/21836659957.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/fokelitamam.pdfIn PDF document text
    • http://jaika.in/images/documents/files/788878305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=if+your+cervix+is+lowPDF 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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 18160 bytes
SHA-256: 411651ace92641ae2469af91f69d033015ff5fe405c009e175ee47c1478bdeb2
font_01_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 10384 bytes
SHA-256: 294745c97325641861f3828231f39924809b963fbfb31a8423798f3032276aa8

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