Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90bb6b3d7ced07d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 15:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7721b1bb1b9250df96f1adff727c8f3f SHA-1: 4577c0df93a6de5654ecceb049233f099e0e1a76 SHA-256: f90bb6b3d7ced07deda59dc6fbdf6728a47ca3b320d55e577fcc26f17ef72145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://krisoc.ru/uplcv?utm_term=copy+messages+from+android+to+iphone PDF link annotation
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/43616031388.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc08dccd3---beketowaw.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/79123972650.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/23529518820.pdfIn PDF document text
    • http://stringladies.cz/userfiles/19716714682.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/wiwiku.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/afc7968a8b8299d0cc0cb4556c0269ef/17134577988.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/53758710850.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/47931602927.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/47235091067.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef9821215---18328720714.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/249a2d2ea8e15d81d1b1eb75c1f73ff4/22509396099.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/82994048796.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/49905024639.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/nitapetedewawagatipukuj.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/2852691873.pdfIn PDF document text
    • https://penal-garazh.ru/files/27745641535.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9cb4ad5f---vezigudakipomibus.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/desedikamo.pdfIn PDF document text
    • http://wenxuezj.com/images/File/ruroroxome.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lakosaparivatonegodi.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/fobufomunipujaw.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/terenizubanabipoperijifis.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/gatekosep.pdfIn PDF document text
    • https://csn-alliance.com/data/files/12720470010.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/26135147889.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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 11044 bytes
SHA-256: c4ba05bfe21c08f33a0dd2ca28f7b78753781fc559dbd2f58bf59b8eb1cfc7fb
font_02_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 17672 bytes
SHA-256: 3cbf58eef3378df889c034b2207e1cf3a3c9689ac049ae049509fb5ac709d008

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