Malicious PDF — malware analysis report

Static analysis result for SHA-256 5286b0a9c07adb85…

MALICIOUS

PDF

87.1 KB Created: 2021-07-13 15:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c25554ae484111f2dd3b18e8757d9a5d SHA-1: 7518bedaa670f6b727e4657c6416c7d2aaa9246e SHA-256: 5286b0a9c07adb853df45c8dabbf85bc1cd16be9703efce15f8760fbd9e35ab2
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. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage download or redirection chain designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=plot+the+velocity+time+graph PDF link annotation
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f767d66820e6d1c7c3e1b25e984c3939/mavixibijanonuziloto.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9c77d5e33125bfbe43472addebc742c2/vegeli.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086561601168---78251103786.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ec58142e5be60cb72e31e2a59234d488/nupagumopuwuge.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6f44382195d8cf95e3056ac25565cf03/92265200657.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/70543691272.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/41218553828.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088e37d23ea4---4869610546.pdfIn PDF document text
    • http://kbchina.de/upload/71125089190.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/67905894346.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210522/file/16216666094554.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ffa1b291---12779670847.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eb5ebc0qc301m5chc07fsjb4q3/28410195493.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dmk7l190v981ldhouoc1qfs1i1/gamorewujuv.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/97710544482.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b156b5cc2da---nufavutibip.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xubalofekap.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/dosinivutajezokeka.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4bd49eff9---rololuvoxopugovazeruroduv.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/792889f668f79bd07de62f9f294a7a0c/93114879282.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/60077305796.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/13671866177.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa31afba3---33996327404.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/82477284639.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_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 10728 bytes
SHA-256: 35703b656e314e5cbb74105d1f63aff0ffd936be446caf5949837380fae15822
font_01_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 17620 bytes
SHA-256: 57476a28dcccba9f5f9797d1d71883341b6c2be3fc3f5a7910a916fc80be8611
font_02_sfnt_off00013723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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