Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2549c71d27fb48…

MALICIOUS

PDF

70.8 KB Created: 2021-09-23 19:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f7538c358c35b1f60a1e2c0ab9dfd02 SHA-1: 6857ad8f383fe6cca3141e41d4f5ae3e95faf0eb SHA-256: 9d2549c71d27fb48f944e3d984a6a2a7483979fae97af6ccc5abae49f3da4f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to external malicious sites.

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://philabc.ru/uplcv?utm_term=music+player+no+ads+android PDF link annotation
    • https://nucamsa.es/userfiles/files/73206911605.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/bubezavi.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210923063014_a5mg4y.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-22-16-13-44-92.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109090129322055.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f8463203c02396c2a7350a4727df89fa/6813106225.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/46025135422.pdfIn PDF document text
    • http://med-os.com/user_upload/file/ziledurumug.pdfIn PDF document text
    • http://pjteam.hu/uploads/20249495656.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33465482612.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161387a188a74e---vefajipi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c190ec5553c4c2d37bacf4a186059082/sujomekedamo.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/86609871822.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/407d15de6994aa788f5be64d3f337cb9/xuzeri.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/tonafunefa.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/vizivetatupuwafilegekakar.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/zezoxeb.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/bepafuxudapejuwu.pdfIn PDF document text
    • http://landpas.pl/upload/file/58590310322.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/gafofanaxikozosan.pdfIn PDF document text
    • http://houselandia.ru/files/65692613958.pdfIn PDF document text
    • https://highrise.pl/file/16317877152.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/vekawekovefuvusenuzuz.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/mufuzuponozetel.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/jilelixugudew.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161462ff93a43b---nowumatef.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_off0000b5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B8 15416 bytes
SHA-256: faf8fdc38197358a30cdebea2b686ec4691966f7adaa2624c92fd5fae5fca062
font_01_sfnt_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 10616 bytes
SHA-256: 9c1b309a0eba7a3ca47276d7384d909dee898892439ddf5dbc4d3c65098b53cd
font_02_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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