Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa7d680a6e75a1a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 11:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 672556ccf364400e7b718891997c00ac SHA-1: 72bc192a7d449ff453c91d392ee9645a002cbe2d SHA-256: 8aa7d680a6e75a1a1a2c91405d87cb2a70388ecb7a25f4acc4fac18fa78fada7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to facilitate initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=colorectal+cancer+book+pdf PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/068ea33c9c457cfb105bcc32f8c731d1/gewotekom.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d76b911b540c21f40eb687bfe5a1dbcc/18373316834.pdfIn PDF document text
    • http://bogema.by/content/Files/mavitokemek.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/8480204626.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/janelupobifuwanokino.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/29430956907.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/79668592077.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/83286310522.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/pafesuvefonatira.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608506ecc510c---vawukelowu.pdfIn PDF document text
    • http://sswjeans.com/files/nulefofupowikefunanevusu.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/sefij.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2b9452ea---48359344400.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9a91f2af---60883938062.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210705155608.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/lowuxatimuvopu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a224854a2d5---wekokinigowavi.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202108310723188711.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/77965284684.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/3035822801.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/repis.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f9cd9cea981ccc66c96acc2dc39e1334/17950293758.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a688831baaadda3f41819c73de336ed2/97883376572.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/faxas.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_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 10616 bytes
SHA-256: e6f4d6dd9008d552220b21417a06d48ac93fc813318c8a2abcaed205a8134275
font_02_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 15980 bytes
SHA-256: 9182b8bb93a039d8cc7e5b26c1290165146fbb3605415587b5f23010ca42c62c

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