Malicious PDF — malware analysis report

Static analysis result for SHA-256 396e253d899056d1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 09:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc652ec5fc75789f5ebea3b5a1a4ec5d SHA-1: a10ec9e2a6d719a9f91e80c4953b095da1148bf9 SHA-256: 396e253d899056d1a8ba77c8bb3ad349fefc760ad854349a96f2dee6fd8bb216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://stringquartet.biz/web/images/fck/file/74314701255.pdf In PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/92894414247.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080afe146775---400651550.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a359cd09ab4---vuwolewed.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cca53585cc3---jumibekagesedokiperutup.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/refagubedujokuganu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/4a1b18bd65dfe526f4fc3df6db83601e/parut.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/96028650307.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/89337559862.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/sunobokakimutep.pdfIn PDF document text
    • http://short-story.ru/upload/file/tiwizizujixatalasemebupuf.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/vamusulupaxiditulide.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc956e515e---31640919582.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/fa23e0e1943956d1818e34dcd0a4c2d7/jepejeve.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/14461815258.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb242efd2---5205531500.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/9684541856.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/22919202816.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ccccd2e941a915e7c5110ed30a056716/medalotulonib.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/zigatafowogapulaguba.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/47711033192.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/gasizarowipelipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ibps+po+exam+2019+syllabus+pdfPDF link annotation
    • 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_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 11136 bytes
SHA-256: 860a0219cd1261c2bea593a8bda4da334c94732718f674c0d56cccc1c7ce29d8
font_01_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 18528 bytes
SHA-256: a01b2764a211f97ca4adddda959f267552339081d08f25b2dd2d78458910bfa6
font_02_sfnt_off000112ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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