Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21ce9509bba07d9…

MALICIOUS

PDF

110.6 KB Created: 2021-08-02 09:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f905b2763544534c625dd717f0a30e84 SHA-1: 39d6eac65db8e724aac3653bfb421566a0d9cc26 SHA-256: f21ce9509bba07d9eef2cf46b4605b732d709183e6c8c96822d721b2d942bef7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and linked URLs point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773f54d271f---videtivi.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0fe9a21d2de2ea6737cd2c11affe42cd/takugamudibozevifawow.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2161917fe4---50006297944.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/80803746143.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de8c9773db3---robanikati.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8bf43bd04402d5c2516bb72070bf0a0b/19420782324.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/55704514140.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a83dc3e2512---97252738546.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gdmm5jqc5phrprtapc8rjd3vev/9566851623.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/xozukokex.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/20509106336.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/pinaxuxavegitarubiwavodu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/401a4c485d3ac41b7bafa3656aef0f54/nowona.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/gapirudaniponepawul.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/jikavuwejuvovame.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a16d46dd---20170904823.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/91816456204.pdfIn PDF document text
    • https://anfauglir.com/images/file/19407033696.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/87839890049.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/xojefevebedaxesofun.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/7530751735.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29454503ef4ab163ebed665fa168797a/69197236013.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49093ec8e689679487c18cf24b543d6c/10095956206.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7670bda68---10444966713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mi+bedside+lamp+2+setupPDF 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_off00014917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16129 19008 bytes
SHA-256: 6f59739f78a430639367a5acc939d1fa266bb58ca82808614453c41fe5e8ceed
font_02_sfnt_off0001937e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1937E 10580 bytes
SHA-256: 8d8742f68116560184ddad74fbbf5bc3eaa59f50c7722202f6f0d1f1b70170f9

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