Malicious PDF — malware analysis report

Static analysis result for SHA-256 2780cfbc0f62df0f…

MALICIOUS

PDF

128.6 KB Created: 2021-07-08 01:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b052f5037bf0bb07830d0106f6460936 SHA-1: 5a97d3875064a90a90268ba56c5511a67f82603a SHA-256: 2780cfbc0f62df0fd407bdf9dd88c14d6583243cc8d81d09bbb37ffbf0244fd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://crewmak.ru/uplcv?utm_term=legally+blonde+scripts PDF link annotation
    • http://mega.kz/media/upload/files/bogesidaposurezote.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/11209153521.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3401e2d24---boxur.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/nilapoliki.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/aua63v7g5e6k91ajdj2es84unq/58431826725.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/32365319535.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/39794735702.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/moxawemepibikawugirin.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3bd1ea7dd4cda46bd0babac5f0d68ad9/ratupakazez.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a95fac8f9ea84002c707c0ef5c42fc4a/wikunexi.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/47782057693.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/fdcouj6prp65bvibi6eupmff01/gosigizopawatatotujulev.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef1c98431dbde92549ee6a5956e4011e/11020815104.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lurusufogifen.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987cda72a31---51212796771.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/64254629517.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/48779131095.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/58369345017.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/zurawanexejililotewirenil.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/bekixupexakok.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160adad2d28a67---46523992873.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04634848e---votasofuzebonururuwazinap.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d3ee8d57f360b50243ac6cd75b8881ed/domujafuzilakino.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f123812d50---78558787406.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/ccf5587ed00871e4da759150c2c3f523/59783811702.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/lutisoralodadek.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_off000199fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B20D 16384 bytes
SHA-256: 5692a9f5bc40a5a0c6becfef80cf2044d5b9fdd2b215c2daeb0428a975afcbd0
font_02_sfnt_off0001dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC37 10900 bytes
SHA-256: 48fd5a97fe256684bc57fe53fc65ee1161a02d25c2633c848eba663c0c483db1

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