Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdc4d6c2f14bb4d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 19:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36db7a14fe7bbee4672173fd72e7ce11 SHA-1: 30c7656213fa1888f46754115874eec626172056 SHA-256: 0bdc4d6c2f14bb4daf1699980b9df5021bef4e2717c8013d90e370bc8a30a911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/770e09660b7ef7a2c3b5e0dc0d4e3f81/begarabagosimivuxijul.pdf In PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/zitib.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/62769235261.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/82355633706.pdfIn PDF document text
    • http://marine-inox.com/i/File/30664366983.pdfIn PDF document text
    • http://terrietanaka.com/library/files/15805053090.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/8825070046.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-12/20210912182605535441.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/23641722675.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132e72d6e5e6---9496209530.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jifufulubiwefutudodajuv.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/runifonumelono.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161342261dda69---54906109085.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/sisabekidul.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8lfkep0vvqu1fl590i4b1m8nf4/wuladutoxekulebijavusarax.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/87883503731.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/32429905167.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/47529693607.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ht2gvnla9cm2srv3cngci5ecu3/67137559771.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202194232995516.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/xobewemanujagow.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bcddbbdcd---zekajiretaxuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a26fba2d91---pixowove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nba+2k20+apk+filePDF 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_off0000c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 19192 bytes
SHA-256: b032ab7d30ddb16e26401a2c62b26d23453f800de82b13c459cf3b958b5dc983
font_02_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 10212 bytes
SHA-256: 4cae19a39a07c004bb3d161f2bef260276ffc2a235e0fc204068fda7bc499548