Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2ebf575d2a81c8…

MALICIOUS

PDF

88.5 KB Created: 2021-07-21 02:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9c618db9759f676d327dd37d2a73839 SHA-1: de32ec730c48fd42881ea8cd1e367343fb281042 SHA-256: db2ebf575d2a81c86e3e6d14afcf35f3051198d51fa2892d550ef9644a419d04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tenfci.org/userfiles/file/xedomepapopunixuzulu.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/kefanedepikowumajatuv.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/72856543327.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abccb4dd564---vexavuzozosiserenubu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f777c913900136c4c8df03a14a428b0d/wezojonejanumamewa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/soasm39f5momfg4rnmobh7s1c0/kaxitokevazidopito.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/zesexegi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/942fbe8314c6e5856adf9b957df6f049/83192189850.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/noronemivipufomiromodusoz.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/rixezuresafami.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/ad36d990c94bd56b79e87608a6dadc36/fozizawosowoxu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b708745fe9c---puxoxojikozonuzigisof.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a31574b5739f5ffb31deab77fff5161a/terimarin.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81cdaa743---wikim.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/4106647198.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/pinekupevuposemip.pdfIn PDF document text
    • https://questyme.com/userfiles/file/pasobugabikafo.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xuvokapebodenepedek.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0dd82efb342ba31fba45d85bc26ae662/kaxoje.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/68580681167.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/47457636673.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b3c4769e---dobapewurebofixekudize.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f0aab9fd---duvevinal.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/38104582945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=use+histrionic+in+a+sentencePDF link annotation
    • https://lapdonline.org/file/82128493581.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_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 17476 bytes
SHA-256: 396c602054564a8db19cf02530a66dc3ce36f781d97a746db42598787802f46f
font_01_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D84 10288 bytes
SHA-256: dca77e3425ff105cec66f52c2b44af764ce9b8938fd12e10326831d02728961f

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