Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad87b0b6f1ee6e36…

MALICIOUS

PDF

80.3 KB Created: 2021-06-27 07:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9a987731ad49cc59f1672fff972ba74b SHA-1: 76217209258a43d798193d5dfc5b3344d13d35e1 SHA-256: ad87b0b6f1ee6e36e95207eb214d3e552c65c8b3e7bcc07a5fcfe4ccfa4ac2b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links pointing to compromised and disposable domains, suggesting it's designed to lead users to malicious websites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kiuruvedenlukio.fi/tiedostot/file/23409113809.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc10121e2---42935966382.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/20135182942.pdfIn PDF document text
    • http://healthywithhart.com/res/file/pugurekuwegosiwedavigije.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7c1215aa---tuketunuguzafikejiwogur.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/eedc74cadc3f38e01333464cedf98eaf/77641077536.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c878be928a9---xegifowomazilizitudogun.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/faviremewemamu.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/19641373417.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/mlhsi46vgbddju321uqeuarmel/17504494710.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/36bffd6d7e792aca1fe5c4793f5d4daa/xiradodiwonu.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/88109752565.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e369c2d765a349fe6c060214b8380c31/3934750463.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b14aa27f574---60126438281.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/56818161491.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c2a29b14ae097b5bc6326ecf68d6868c/30862909930.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/zojaxofebovowafikesoxijox.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/28464074030.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d200e2ec99---tazomogolozoma.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/56419627257.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/geafpnsn6624j8dr3srpv31cbj/44073698095.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/relosibibazinusabepejufi.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/0a39feea918e88a1ec7304e9482ad94f/49469003009.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210627065827.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/23708063263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ca+final+sfm+nov+2008+suggested+answersPDF 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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 11432 bytes
SHA-256: 1051c5a76e7b99ed94cb16f451a99a3fddac1be28c863daced37239b802c59ac
font_02_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16700 bytes
SHA-256: a901bcaf0cf96e2956d2f4e1fd37e49bacb65826c1fbfe561d1be44c80c5d10f

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