Malicious PDF — malware analysis report

Static analysis result for SHA-256 204a804379036ac2…

MALICIOUS

PDF

82.5 KB Created: 2021-08-22 06:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fdbf4b540c45ada03142c0bf6337c60 SHA-1: d4ed462ebf1190ce6c8d18591ec48cd37b0760d5 SHA-256: 204a804379036ac23d1bef21d693ca81db114aca8d666cb0c2fe2ce2f1a75a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user clicks, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://huntic.ru/uplcv?utm_term=miro+clash+mod+apk+th+13 PDF link annotation
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/66d43ccff32a0e82c3292ac731c4f0de/4583771238.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cahvqtd9ubsmp8nrb7ffupk1q1/lawofelematumupepobeviga.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bubopepimazaladoxadopim.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/77f1c3cd8f48c9d4d782fe7786eb1484/gupibadupivalifegatuv.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/jepupenin.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/pefituvukekozevifuvereje.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/fudasasajubugemigepod.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/dosufegikujupuse.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/moneg7q6r7ilq5l47hf96v09ca/zudazedupala.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c220c18c912---jizalexeno.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/tufojizimeruwujivuvi.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210807_D3FC309D83CCB42D.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u75ed6c8vndnsbarai1sirp8n0/navurozimeguravevuxowe.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/97596006536.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/punazag.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/motazametipusur.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/luwagomozezaxexurasupip.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/57563723971.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/zaroperotu.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/legopiguvojawufanoguritej.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/galopasi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 16884 bytes
SHA-256: ccb61d0c7c70ebc7974bbbbcb494024e2926cb00f4d1d307fb693c0fedf19ea9
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 10852 bytes
SHA-256: 1c1b22b84cc7566a816f971762ad96c201cb06d9567361e870e7063fc8924928

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