Malicious PDF — malware analysis report

Static analysis result for SHA-256 768e7284391c59e7…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 02:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45de6647077d054bf81dd2e2c987de76 SHA-1: abdee3a78ea15016025881334d2cb9d260384b1a SHA-256: 768e7284391c59e7ebd028615ee40de2fdd773172315867692ad0fd136329e7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=gi+joe+second+movie PDF link annotation
    • http://ceroki.com/image/files/duzukatovo.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/78503397713.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/mojozurulovifaxolodusim.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/53174896802.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8ecd654c---92439346850.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/famelol.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/vususafiboxafimojazenokex.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/wurejuxesagole.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/fiseseguvanupisavevimusiz.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/zobidulumukaxir.pdfIn PDF document text
    • https://tch.lu/files/files/xitavadagonineg.pdfIn PDF document text
    • http://turatabor.hu/media/fejimapugojokapebepud.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/25600012180.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c8d3d49694ffaf299fa9a5ab03cf6f91/pamidal.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/mukoxewolufusokojexiwalaz.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/10736089770.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/73249810185.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/balugemejipewa.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/68862958048.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2650043776d33b524c2e352653bd507b/kazekawesixofasuwom.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/betitolujevase.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/55734663167.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/15570351072.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/18604301180.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/68351730062.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/22130103091.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_off0000c5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 10360 bytes
SHA-256: ef882aca892ac48da607cd762f7968f5a2b65000a29338a9c8c102be226c2a4c
font_02_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 18440 bytes
SHA-256: 86877ced9968aa3d9df9eeec3dab6ee25f2352f912986efd6b29987b4934a304