Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66d5f9c4a0150fb…

MALICIOUS

PDF

93.4 KB Created: 2021-09-01 19:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98fee5b315b95492b2dbe823a2c15083 SHA-1: 9591214a6fb77a651e00defc751a289eb5842e58 SHA-256: f66d5f9c4a0150fb50aa5268151cf5077c510629bbc63dcbd54f7ac0c368dd52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on disposable domains or compromised WordPress installations, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=meaning+of+scapula PDF link annotation
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/jexajoradadeku.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/baburigivadi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899fd81296c---belevofevita.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/wegumebosogujiluv.pdfIn PDF document text
    • http://rc-modeller.se/images/file///25499701090.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/a4c5378fd527278efb2509805555be8c/60359662250.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a408d2607---98293880049.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/sifepapupitovuwekexirex.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aed01794408---jaborizizijo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55b6b90ab---kukizuxurojilebuvi.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///binezofafidisowi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c156e9adfed---rofedon.pdfIn PDF document text
    • https://bursac.net/userfiles/file/14362065404.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/likutu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b1d9c41a---33503616634.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/sevoworawesiwinoxunoj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a6ab2fba10ef71dd3b0b5f204abe260e/6470520595.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/65274275713.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ba1bd021e9af645a193f7ab485154b9e/75073771732.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/kepopojetofivawapab.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e57b65672441b8c18d1ec67c555ea98b/gizefanapozitine.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/dakunumujojeverivaxi.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/zovisapidubavovaj.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_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 20400 bytes
SHA-256: aec8de203c7067a7130d5110a34a35283b3458f792a17f1a79948352cf9d12e8
font_02_sfnt_off00014e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E43 10548 bytes
SHA-256: 59d0d77de3033a5557980d2ade406ffb3c80818a8cc02818b804219f1dea5a75

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