Malicious PDF — malware analysis report

Static analysis result for SHA-256 111170f536fd6bc6…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 14:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22453f3eafe370a6f95038a2ba2c6b71 SHA-1: d0eeed7e3aa506aea89336e97116512b1462ca59 SHA-256: 111170f536fd6bc64079ea41416455947eb06dfc54790062b35c88638380eb7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=formule+trigonometriche+triangolo+pdf PDF link annotation
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f99986f2ef3---44176655228.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9f30e6bb8f37d97eea6c9c4511162d93/wezux.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/makazelukuki.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/19543448697.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/44169369944.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bd06d0940---jimidovisegekod.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/32830701108.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182499af4b2---rexibi.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/daxazuzi.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/ponebet.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/93862724675.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/886a6f7f756d126ecfb81c1d80dbfdc5/81873907746.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/k76gesie1kj6ed1i9dpm02uuq6/32222937905.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/27692981683.pdfIn PDF document text
    • http://df-2.de/images/daten/file/86090046517.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/4083444005.pdfIn PDF document text
    • http://siembra.me/uploads/files/pidinidawoguresa.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/loziposorutilefu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fdedf9915b740a8a8faa970b499cb2fa/mikanev.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/zusutufofusuge.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/uktevldkh5apluopiv7fr03rf3/gobezisetelubasolatim.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/92097701656.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/bivibotifol.pdfIn PDF document text
    • 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_off0000c3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 19864 bytes
SHA-256: 669b9fb8c506841bd43843e8af112c634fa3179a786d58bbb618f6bc49a3dc0a
font_01_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 10976 bytes
SHA-256: 52485fef1a8a239d033288e2c5a2201b1fc0c131d25250598d503de9107bee69

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