Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0e8c3a592dbc8f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 06:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d8b8ccbc350d490a991e1e6df655a5b SHA-1: 311dd27e825787f0e13ee24d2f49ae6ce637bebd SHA-256: fd0e8c3a592dbc8f65e12496c5527e3df1558cb81225261b92d7f888d42cb1f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure suggests a phishing lure or a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/15467054729.pdf In PDF document text
    • https://vinatech.com/userfiles/file/xudasokitila.pdfIn PDF document text
    • http://parfumland.sk/upl/25354477247.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/71458966912.pdfIn PDF document text
    • https://anaksemut.com/contents/files/22719908502.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/58215735026.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/63135787434.pdfIn PDF document text
    • https://ebooksweb.net/files/file/65105707589.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b2ulq94tkji03aob74e0avrp1m/50086061015.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909093757.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/fovesijutasebisivisuvulub.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/65988691293.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/25745167227.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/7182701664.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc40ea893---60874884172.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/76617019553.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2aca5eb0---81073246234.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/59657106111.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/soriwab.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/safijizonupovoger.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/salis.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/fepilaxosezowidofaz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e7dd399fcc84807ff3ed25e69ab83cf7/77053431712.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/59627439336.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/8687334170.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/33546016044.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/junapo.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/41333275154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=live+com+au+sign+upPDF 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_off0000c475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 10596 bytes
SHA-256: 9e7d625560b035c98922fc4a9385c51f21d7a8288fb902069d749a228d43f376
font_02_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 17088 bytes
SHA-256: 270a31e6775e1a483a4f0ecb3c619609133c884c57913b1958d1052c22a925c6

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