Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef4360a9e8fcfe1…

MALICIOUS

PDF

83.7 KB Created: 2021-06-28 12:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b980c5ea212eb01af8cb600fcd073b3 SHA-1: 0bf8e733c4474bfb5a2c06d2e798cf209a6ecf13 SHA-256: 5ef4360a9e8fcfe149d4b31e75fd98741c043f87e8e5abce49381cefc4cd8fae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or trojan delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://obasekiestates.com/UserFiles/file/5108261950.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29cb12a0a---13302315813.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c111dce54---70442536802.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/j8fe8upch2oe0gb82fs0u447os/26293321828.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8dpd771u98kc0l42shoaob5bvc/gulaxepuli.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/29debc16dd1ea0f5ec177a9c68c671a2/galelenajuka.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ee65a00924990e60994b5ea6d7446a74/19309803502.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54cc19028---ropopo.pdf
    • http://ahkjt.com/upfile/file/malan.pdf
    • https://avenue102.com/uploads/file/22019474519.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb04e514e8b---lewuvikesakap.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129f603d6e---ziladenonozibo.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070a445ed6de---kofutidositek.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1524ce7c44a77f3151d500ed083d7d47/farejezujozivizo.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7471a643c181e6d72485ecc3e2ffa1f7/jovuwulugabaxizu.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63294927000.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090f81eda7c6---zulilutaxiwifek.pdf
    • http://ackerviewguesthouse.com/userfiles/file/10594097613.pdf
    • https://hkbca.org/UploadFiles/file/20210523114256127.pdf
    • http://njf724.com/basefile/janatalnajafcom/files/23386971997.pdf
    • http://zrdb-drogbud.pl/Upload/file/19820368387.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6e645d49cc9e25b0be75d2cf645aea0e/55886575588.pdf
    • http://arslanemlak.come/file/63992402755.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=age+difference+calculator+for+marriage
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55e.bin
8d04a4438efc939cc3e41293fcd73604b90680c031d2c53838e17495feceb8b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 16712 bytes
font_01_sfnt_off000110ea.bin
4ed4853190132221618e0b8b9bad0362ab52c851ae966bdcd688fcbcd0c61843
pdf-font-stream PDF embedded font (sfnt) at offset 0x110EA 10732 bytes
font_02_sfnt_off0001295c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 16792 bytes