Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec558686ca51543…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 05:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e76d0698e8058bc76be5d66025e37a1c SHA-1: 1fdfcdf5c30dc5282278631a90b900f14d7c7201 SHA-256: dec558686ca51543425a6df77c986de2f7f504a5b945520ed4767d78e82735a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=keyboard+cheats+for+gta+vice+city+android PDF link annotation
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613326a0eb712---ginedazekam.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/26466330630.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2a6907aa9---rolavavofimosusolanexufax.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/49782254407.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/karorusezifogipapapimu.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/jobixufubavepovosero.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/68136308422.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/36798759417.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/nidesomegepetixezefozopo.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/17769531352.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/1822986151.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/66831006995.pdfIn PDF document text
    • http://premo.at/userfiles/file/41133077416.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa7d6ea32---51903189129.pdfIn PDF document text
    • http://aotmoo.com/uploadfile/files/20210922_023629.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59e46bd0e---buruziwanitogozezaginuka.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/30513215662.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141486e271c6---6783385002.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/lifanugidedakusirazazigiw.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/94842330653.pdfIn PDF document text
    • http://askort.pl/Upload/file/59127777568.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/doxibe.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/morejusiwaniwiwadixi.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/somudobuxoxewepew.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/59881829650.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_off0000b428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 17080 bytes
SHA-256: bff4783c23eab2004b0485acbfafc3ba5fba8f46fbd4a8956c9a15973bd62090
font_02_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 11020 bytes
SHA-256: 2bc3b9f86baa9b00a120842b7072d1e3f6cff02c3c501d341ce9b7b975b5ff7f

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