Malicious PDF — malware analysis report

Static analysis result for SHA-256 6276cda76031d364…

MALICIOUS

PDF

91.8 KB Created: 2021-08-06 16:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 4cd6e00311167baf9ac162b2ba7bd702 SHA-1: 491b4b159e3e908051f8fa1e9fdc9233d80a8af3 SHA-256: 6276cda76031d3640d63277b180b63f1da6f9226ae65f510849a827397c5d4c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://medvor.ru/uplcv?utm_term=how+to+factory+data+reset+an+iphone+8 PDF link annotation
    • http://www.jobsincrete.gr/images/_user_na/file/gibulepokolonexuvajuwog.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/1dhda489b27oeegkf5hjmtha2kegqr9d/72296776999.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9913f52b12711a9bb042ae4057663bdf/pajarofusidanepamere.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67d8b9b4a---87096803136.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8qnsap1m0nt93a815b9r1l3a2e/mibewoneboluzalulex.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/43175421613.pdfIn PDF document text
    • http://ubest.ru/images/file/62454058070.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/dobenutojuxobasigav.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/mivobezoxinamipofopidexu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b631ec638ff---14109395541.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9ee017df414a8db5104f816267565bfb/59499427799.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b56724cb319d2979bec25b7595ef1066/lowunasitin.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210721070408.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5873df115---petak.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/71255970735.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/dc35479eb5a0d8cec5a2496bdd3c3fcc/64843311898.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd58734808---62812937418.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0546a6912---noboj.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c336d617---32710440240.pdfIn PDF document text
    • http://zenithmetals.com/files/93120590344.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/nexigafofurutovefugi.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/b7mal3gf4ak1v98l7ol8ofisp4/gosarigagawonuniti.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n7r4fjka6k1l3mb6j6o1b2ahqi/10548544018.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4lgshntq5m6boh07m6dg5jrjch/42926411204.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/54523091135.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/99635955497.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_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 11068 bytes
SHA-256: ba67d3def7aa86a32ff07906feb0d72b66e9b5ead702a8fdd1e0002f6a988227
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 17108 bytes
SHA-256: 71aea59ab18cd26c819c690797148f41aa2a415869bd83d92c4c81a47ead78a7
font_02_sfnt_off0001495f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1