Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5661cf1b2dfeeb…

MALICIOUS

PDF

99.6 KB Created: 2021-08-03 11:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b38cd18ff78e0865e7393723a621947a SHA-1: 08c4e1054a8f93a92aa508e896633f9cb7d93073 SHA-256: 3f5661cf1b2dfeebf7176dddccb1b3db2f868fec290afc9345120ca321f4bdf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on potentially disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/pasegiwitefudezeme.pdf In PDF document text
    • http://kunmobile.vn/files/uploaded/20210730/file/lemunudena.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/gonudusofarelixizasutup.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nibadipatujunuwufuv.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/getidafekifazavo.pdfIn PDF document text
    • https://highrise.pl/file/89326176207.pdfIn PDF document text
    • http://hncastlecable.com/d/files/velijoxitevebidolepus.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/17318281967.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf6429403---35863525679.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/riguwag.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/durivewufatumelibewogaje.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/47768003352.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021681818576842.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e618c82aaa3---korababifonugigebovederox.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/a37af1944826b78d3e5f91a192e53bc6/rovok.pdfIn PDF document text
    • http://popmetre.com/news/files/73444399798.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef758e342---kanobiwajamekotejupod.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b16b36c02cf5a4afc0b8bff515e1abe0/vilivululobil.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/42897920490.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/sikajuzolaxepigi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/92689ea71d5b1af891c659f97589076e/nuket.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/romodumodimup.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/dofetoliwodifoxegab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a%2B+guide+to+managing+and+maintaining+your+pc+10th+editionPDF 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_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 11116 bytes
SHA-256: 9823ce775028bd7672952a714e08548765cfa9e6ddb11cbdd614a6e8f086741d
font_01_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 18212 bytes
SHA-256: f2f67f5fe69867dcf7599798d1ccaedb49e208d224a4e769fd816343bde9886f
font_02_sfnt_off000165f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.