Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa08828229bb02d1…

MALICIOUS

PDF

80.2 KB Created: 2021-08-19 06:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db2b58ea7c4ec59b17de631311089d06 SHA-1: 4ab7ca136bca4ace37ee4cadc8d6a844427d1cbc SHA-256: fa08828229bb02d1e86b769fc7ffef8eb186ef774ce75f6e1fda2a42e1707e9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://tutaylamhet.com/storage/ckfinder/files/nixitiganotemijujilidajev.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/6posln82cg6tmad690di5almd3/wuvifuxibavewuwi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/29253658882.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/50288165482.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/jajimudeluf.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/10177518012.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dakisezokugikusijo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85a7c450a---datukukijifodukaxanipuloz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d799c7e6---17964615593.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c6nevhbv5n4mtr7giqbhp8mr57/66767085945.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608524e2dde73---28170384896.pdfIn PDF document text
    • http://deauville.ru/files/file/57766500846.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/demejexe.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/43752020203.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/pitemimarabid.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38529215951.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/jasofezovukemojonug.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/48718882850.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/63952a8f7f5c5b94887d3c049c20a60a/43745792038.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/6333489009.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/futarufa.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/74ihmd2m1iodvgqg821ql6biss/36258546960.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/20212088686.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0a67a487---taliwatogidutanuxajerivu.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/towam.pdfIn PDF document text
    • http://ministerium.pt/files/32080582585.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/fotilogarudenunupajuvikeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=holden+evening+prayer+downloadPDF 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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 10560 bytes
SHA-256: 81010d8349fc9a3a4dcc1227206ea93e47deca92719f4efa4a716dbaa0149668
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 16540 bytes
SHA-256: 178e93a4af03da17cb92d831c16b091c322627030bf859f43473814cdbf356c0
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1