Malicious PDF — malware analysis report

Static analysis result for SHA-256 6629a7c21c0345aa…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 07:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76f1327cdb732a5a82cc843842bb4b46 SHA-1: 6e3da9aab95baa2dfb274a21bcbbacce8f100e57 SHA-256: 6629a7c21c0345aac0c2253ce1e1d86a022fa13d2729548e8f116f58469d3224
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://flomogroup.com/upload/files/67338210978.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/wakokovijulof.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/ligonuraxiferujeganitavo.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/kivibom.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5f7c467a39859195892fd93fc72c615c/58412406616.pdfIn PDF document text
    • https://equimat-cheval.fr/file/21695963446.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141ace45b7a9---88752724856.pdfIn PDF document text
    • http://adveotec.com/img/file/kejenatexisuga.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/penivulozi.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/gufamiramevolo.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/94375292756.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/bitunovivibiweteza.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/94496260470.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/79904333215.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76055918901.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qgh958m5h25ss7l8rljj01bm7q/gamebigebozedefakanosulad.pdfIn PDF document text
    • http://speckrepej.com/upload/file/xukixowugotekoxitunesu.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/dixabikofigezafizafi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161310031df993---30366552266.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a3de572d75b5a807234d8a5d0afda74b/lelolasotinope.pdfIn PDF document text
    • https://asi-filter.pl/files/file/53987201853.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/nulumokadovexizikor.pdfIn PDF document text
    • http://rapet.hu/files/63603203422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=aplikasi+download+lagu+di+pcPDF 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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16012 bytes
SHA-256: 8c584a9c3b2258f4d86b1d47df86ab83d4662dcada4979ec3e875e74fe9b98ef
font_02_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 10620 bytes
SHA-256: 518e3231f1755bb1b2b8a656516239bc45af178301e4c8a6385619aae4abc472

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