Malicious PDF — malware analysis report

Static analysis result for SHA-256 627b5377e412710a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 06:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40f9b2465c23729c031647f58aa332cb SHA-1: 9210072664aaaf6ba0405161c3d21af196464db2 SHA-256: 627b5377e412710abae35b5a8b1ce33b0600db7c10d8ca7862fa1f2364a66b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious files. The presence of a feedproxy URL with a 'download pdf reader' term further indicates a phishing or malware distribution lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cerritos.songhakbbq.com/uploads/files/86552205829.pdf In PDF document text
    • http://unstitchedfootwear.net/files/file/2956046153.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/34324008992.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/36157188952.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/22439730676.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210619_A6738534D06A712B.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/llg22vt0chvk547qpcee64v1g4/xejed.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/90318586990.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/6e5beb37988e077fb2a1188a56cb1dec/27640585300.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/89334286427.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c778fed6029fe9a48b08c90b5c40cbbb/95667700313.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c45c767f08e57c7661e5080ffbedec94/masapuzivoti.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/gozewexagazusulevipib.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160935c86af78d---82388954884.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/budonib.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160860a68eb507---wetowad.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc308bc6b2---fujuta.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/81904218421.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/11662328312.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/flcfsbn83begmk3gdq7s0l77em/bimafiwofidolonadalazak.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/bebuvukodudusadi.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/mevenukinabuvolasivodas.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2ca2a56454f3498a202c02d085aaa91b/89559010244.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d57c60d7---dinesaxorisakilatixog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+pdf+reader+for+laptopPDF 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_off0000b6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 16216 bytes
SHA-256: 43e74469a81b395f9b9b4281bc063b2e9c7f7c3b85a22896f5f21011a78e90e5
font_02_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 10320 bytes
SHA-256: 296c0a9891d522d3a88581334106552a7e86a3b472d7ab198d942504faaa30a1

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