Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb732439f472e77b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-22 20:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21dd99d27b1781024e8efa7ee9340e55 SHA-1: 14b5b4055d17ff044bdb346fe3de84c2db0d3831 SHA-256: fb732439f472e77b493a8d589fa0e75dfbb8d28125e7345c9c24cb150fb34a25
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://garmagostaran.com/Upload/file/96627836966.pdf In PDF document text
    • https://jobtiara.com/files/files/sajepusane.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a29998f41ca---97373282880.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160747639ddb2f---fosugo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c224aa35df---lojifabusekoze.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/7813077048.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/87f56ad3d1dab3929cedc85e82676007/29545092336.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6thmnmvk7vf6hf9uafub9tv1d0/bekosexeguzixogedemomamaf.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/wifelelawomuvewuxoxuwami.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/dinajusi.pdfIn PDF document text
    • http://belst.by/upload/file/semodusajawo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/62822088384.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c835a3955a---fexuderugorejukofiwiwexa.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/25377390865.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef740d311---lokateredubeles.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/bf3e43a62455d98273c700df74a96e49/91599140570.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e547852547---xunezuvozeji.pdfIn PDF document text
    • https://codecs.ro/images/file/gilaposebasejavofadojod.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5f1dff19---sinigulezato.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fc1c3e3f4---dajiwuwapenopuke.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16071b066b472b---jokeno.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad0026f365---24881707672.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/sugajuxuso.pdfIn PDF document text
    • https://actorconseil.com/files/file/89505926130.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/32424245107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=app+that+answers+science+questionsPDF link annotation
    • https://lapdonline.org/file/manulolo.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_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 17744 bytes
SHA-256: bd0846dee702b29a6e939a32b2cab29cc24a1d2805dd1cdcb1ca9d1fccecc3ab
font_01_sfnt_off00012352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 10736 bytes
SHA-256: 5b1c0e2e7cd75dcc3679181b44a56eb97a11f0cae790f577371f6294a5bc8bfa

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