Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8e66250bb3cffa…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 22:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfae28733f9192a55bddd67bfab838d2 SHA-1: 0e99bdc1dfe77b7741b6cc65605e219bbdde753d SHA-256: 7a8e66250bb3cffae2e0289839ac74bf381f3186c612108df43c89bfa8223ae4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cantellodetersiviprofessionali.it/uploads/file/kaxugi.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612071dfed03b---pexotik.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cecm8uic7h6ou8svl5oid8pth4/seripapox.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/ketupemonelopotenujuwoja.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/9675560226.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/53450792139.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/6820007113.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/rasajudidodupewozunazu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906a49a2ff9---65992702144.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/xusuwuxofakelatasikokuze.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/38912795822.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b24b8b3d3560ccead4c46f0b1bbbcc7e/56951792105.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/sugufumag.pdfIn PDF document text
    • https://htchninc.com/d/files/vizirawipizanubuluzuroji.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ik26hke9e7it9bfh310rsq55g3/91585319309.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/44544133822.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a648c94d06b---88748112706.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/39266232630.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/74933218140.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/jevawira.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/65047700438.pdfIn PDF document text
    • http://tano-cable.com/d/files/xipegebopunizezimam.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/rujuzeveroxepudafexawegen.pdfIn PDF document text
    • https://citytrafik.nu/images/file/kusewalabikop.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5bb6ef86f---97682405577.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3595cd4686---32608083960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=straight+line+method+formula+pdfPDF 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_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 18612 bytes
SHA-256: 1a41c0513504de49b3465d38b5d22616ae0ee054562dad1196289b17ad16e69e
font_01_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 10952 bytes
SHA-256: 8e726ae00bba86c1587d1b681fe3e7a6153be8e4f095f8997e53023ba9959979

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