Malicious PDF — malware analysis report

Static analysis result for SHA-256 505a51bbff4ffedb…

MALICIOUS

PDF

90.5 KB Created: 2021-07-04 07:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c074c61fdc8f6f77b88f0c566d39f2b9 SHA-1: 1eb90d92e3c07bbfd0aa964a2ee173864e36d719 SHA-256: 505a51bbff4ffedb9e9cc804a2a74c74c69c538a4d137a655d646733b50b0232
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, 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, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4c689551445eafda4ca9900e429a18a9/buvuxufapukudaxa.pdf In PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/davosodopitenekuvebato.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4c03874e9e1ce3162d90f121a1fae2de/zijam.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47264246c---xafodilapojazapurawon.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/puniwifevusuzigogutifinik.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb12db89a0---xatuzivijijefoderisilij.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/90705194705.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcbcecd63b---pafatomakasujujovetivuk.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/rurebawo.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/91599514864.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/27118457785.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6ac12a0fbec8387f3fc00a5bd002c6f0/fegelugusiluxivavadufagas.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/35ql946jdbr96lpn0flr0at3h4/komopok.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/75554552863.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2ff6e4e4---zikujefijuxopijo.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/liwuzalotuwuj.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf8d2e791---gizolukopametijagamosomud.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/llv0jhjuornbhldf62aoerjra6/15730250878.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/jurolodoxumopurapev.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/rolugawasavitaniwupovinoz.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a328bf99---16824198105.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a90b13df5---9948251334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=four+hundred+and+fifty+thousand+in+numbersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/64392b6108888bce7bd72b4733d1c4e0/22027269386.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 10904 bytes
SHA-256: 516f3a646013c2821f476e0e606b6a265805facc1145e31216ec73f6de4a3a0e
font_01_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 16152 bytes
SHA-256: a296b1387adcec6f3b2576628ea92b3d2a56d809f0e877613436961f86b2f7ca
font_02_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 17508 bytes
SHA-256: 4d438470beb8d21f443458e0344a7ad69de044ebda1620dd16e0713969addbe8

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