Malicious PDF — malware analysis report

Static analysis result for SHA-256 723998caa3ba9e24…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 21:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccf89488d007f3dd9cbd4e7bb9223729 SHA-1: 22d5846af133a2a113f360bc1481b547234b62e0 SHA-256: 723998caa3ba9e24912b38818bbac8929c0ab56feb51ce88870824da93ef464a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/57180657149.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dead95cd7---xexizakizonadi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7224e48d0---sojobojopimune.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/fivepefupogogavuxawetekok.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d25b7c41b---wejifaxanufu.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0b469e39---87488586865.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/76157386211.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/5281075910.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/majuxolalirewipu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/69090116978.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/38172363007.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/17afba37f8eef0cace66071016b9a8cc/duwelikewupujutubaf.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160887cc37e34c---pufukizegani.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/tovenifilot.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/walegepikufixer.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2395bcdab---wegubevenegovugomox.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/1207063478.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/26361419464.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/64565554278.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/gezarifoxuxo.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/44170338799.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/27606315367.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e9b927ae---zimasakosiwirajuripulafas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stay+of+deportationPDF 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_off0000ce91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 10468 bytes
SHA-256: 38012c0da6220d4b61a976484c0dc3c7b2c1c4d07b818ff11adcaab9b9651813
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 16616 bytes
SHA-256: f103daef78942228ed8c807fa1e51df953be6e0769062260faff652568dc1236
font_02_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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