Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16cc66327ef108a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 10:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbdf1cbf0725f07253b6bbcf7d62ace3 SHA-1: 54cb0ebddca2f04b3e1309812ca52798c7051f74 SHA-256: f16cc66327ef108a9caa22936d5b2525358a2e7d4a4272645c5ecbfba84ab58d
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristics indicate the PDF is designed to host a large number of links, a common tactic for SEO poisoning or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=kensington+orbit+wireless+mobile+trackball+manual PDF link annotation
    • http://carlaschroyen.com/content_docs/tovelosinolelok.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/xajexapoparilej.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/97beb0928eba5a7d8cee3699d95d932c/2663232653.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/newosoxefagisipodavel.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/25994355707.pdfIn PDF document text
    • http://dnepropress.net/files/file/regazeziduwuj.pdfIn PDF document text
    • http://iccarrentals.com/files/file/36282420502.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/64275454003.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/88516065379.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2aff862363---61682192495.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/14507023098.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/bupefagutosa.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/82956015594.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210818_095415.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/22847316505.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t4cqve88sprnj9spr5r9g5meu6/37235296359.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/54335203921.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lisekagajubapuzozuwegu.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081103301528---62928618346.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d4b4bf7f---76040643981.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e91d401733ceea03588682fd16746266/tuvovetafesoparewijirobu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c484b2302c9---gezusupepozelonob.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/bujadomajitavire.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/10183568342.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_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 10980 bytes
SHA-256: c28cf3e8b5378ef13d830b94186fd838c07968c3f6368c48b1bcf242fbcb2ffe
font_02_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 17384 bytes
SHA-256: cbeafb85e7eab332a08069824ea2b66ba98fa57ceefd2fafcfd83f08ea294202

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