Malicious PDF — malware analysis report

Static analysis result for SHA-256 807220e32f7d0e6f…

MALICIOUS

PDF

94.3 KB Created: 2021-07-01 12:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7dbf54c6a3cee58f65dcf04f4604e306 SHA-1: efa9cf32ed9f78faf16a90a06442363f0013fc32 SHA-256: 807220e32f7d0e6f087a4496a44ba26f106e10a5261c64cc6067fdea6744767d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially compromised sites indicates an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078820745b84---bevebalok.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b47133aa8af---10201403142.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/3d9c3dad99963028dd702b08d02c12d6/posuwukesemepuj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5189c031f5---jidefugagepox.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/zeriwezebanemanun.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/sewodofuzik.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f02b20ed---51632728668.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6103a985020ca73cb27d8eae0ec928e0/88857316133.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4d37118650264ffbb092fddc5c6b1684/14804428464.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f3df0a2e---pedagibazome.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kutiperakozunog.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085415481de3---zisuvibuvukuserixofutari.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/4d90a66c975d0d5eca860fbcbd24ed28/mobisizepewavowosivumu.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n5v1lb1ja6u9vfjcoo7rj09po3/67786779883.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/99e02b612f11284e664717ade48d8ee0/4835316551.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bf5c709c9c4a16a4241462bcb032c014/68437166872.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/juxogevituworo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/42533336188.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cd12966486eb89d1a8ecac5cd7a10c38/tevegazile.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/jakowimuvu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/h13h73brgr9fc4piovqo6ipnqj/55656838632.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dbc8e3289---guruwizoj.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/64026822167.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/onur3ridi8t6dge4702nkqnma4/39602534376.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/p02hm4830tdbfdh72snuguitgs/megezominegojatu.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/dajapijinunanomug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=imperial+class+star+destroyer+lengthPDF 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_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 17280 bytes
SHA-256: d1824c3eff5d7c493f864f4ea4b992c537079c82bce09af68824d79dd32606df
font_02_sfnt_off00015023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15023 11024 bytes
SHA-256: 1fdbaca0d691c410762897112d9c41012a0688ff1c8d1b751fffea15fe55eaf6

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