Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ed1df8f06d4ef5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-08 07:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6c3903674965c663f08406af8e4d928 SHA-1: c26ff77a9fb282341eb63434d8c3fc561312288c SHA-256: 19ed1df8f06d4ef58a2b96a2a4b44f4787d07a08fef40d821d7dd917599a05ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting these sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=zoll+life+vest+patient+manual PDF link annotation
    • https://sasalidayanisma.org/uploads/file/17072362827.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/da34e23ff21bd7679fa1cc1aaf786ddc/83546373908.pdfIn PDF document text
    • https://seger.cz/userfiles/file/benulosomamuzanoje.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b31b8183f---10346016357.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/88140548885.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/96260590086.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/70639019965.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/aa09c776ec14d48fe12f74a3471d352e/20368228970.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/90012869668.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a425da698049d6e7af876b472dc21254/womanabejadimub.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/51995236075.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16106f0f9ac037---nuxuxetimekarusidox.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d800088465b7645932e56a575af9913b/ledogikago.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/rapebopesenelivo.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/bepiwemewexaj.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0b51bcaf3---gokaken.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/f23p8f3qqdmv8e3uf30ijpireu/11416795294.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/ralopevasumuzufemosa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dbd58f8c3---mebetoton.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/53166878116.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1626727971.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/39006824031.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_off0000c4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A3 17688 bytes
SHA-256: d2c09fd973d90d93d1b06b7e9c3c650592a14dab1eb704c8f37937999346055b
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 10548 bytes
SHA-256: 56ed6ed76d0bf0557e30905c0aa9c1e1248d385f6e141d5961d375a4a2a3bdc5

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