Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9f3c5d0d7ca715…

MALICIOUS

PDF

75.5 KB Created: 2021-09-23 07:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c83cddcb262cd7fa2c11cf4bc89042c SHA-1: d77fa428dfee335df7aae010a223eab40e021863 SHA-256: 9d9f3c5d0d7ca715ac9f365acda5661024bef5a809b497e6706ea56c0538a1ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its purpose is to redirect users to malicious content hosted on compromised websites. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

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://inwebjor.ru/uplcv?utm_term=ipc+basantilal+babel+book+pdf PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/abb3e67e3238bab6ad17d562544c90a5/nevuvomizovobin.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/wikasizinasa.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/vitijasidozizojubipeg.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/2814182732.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161308f73df5da---tevineniwatumotivokifikiv.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/tokavowap.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/93624187231.pdfIn PDF document text
    • http://toroisg.com/public/images/files/63631171276.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/93520058519.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/25719866687.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/dakideriwadud.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kadadiwew.pdfIn PDF document text
    • http://rsentco.com/upload/file/19026278504.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/punakusijex.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/20732125177.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56459511309.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e2e013ac80eacd16981924c6417e8e1c/rimenidapotavonezerexi.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa270f8ed---39152400259.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/fekiwesivubosamoxo.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-8/20210908010217969486.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b9ec665dd4b0cb55bce18bbf69b7e3ff/dowaw.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/54794834327.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/sijixopevagu.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109081623143837.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/62902385909.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_off0000c192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC192 17536 bytes
SHA-256: c9c0dfa91f4c7a268345621f05b2c21c2b04a0a7f8eb4604c4268a745038dd7d
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10696 bytes
SHA-256: 638302521482b2ac97623f8194b2d99fa497ab29bd0126c9387d0ab122b895e5

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