Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26b8ca96acd15dc…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 07:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18d1d09a1ceeae6860b0b3bff622eb53 SHA-1: 134fd39d96afbe4621dbbba8161aadb6e33b6e3b SHA-256: b26b8ca96acd15dcda665d2b5cbf2aa63ea2cdd069a6696aa01b1d2b61e002f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://baoholaodong24.com/userfiles/file/bejuwanozoludegidem.pdf In PDF document text
    • http://insuralead.com/userfiles/file/zujeboburab.pdfIn PDF document text
    • http://gro-felix.si/uploads/81860854279.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/nesozufupa.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/55481325983.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/27780068853.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/20427046400.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/rurazumugidujege.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/28529415297.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/52170d9e410d9d3a8e015a791ffb9c7e/dukokuvab.pdfIn PDF document text
    • http://keyday.ru/files/files/fojawed.pdfIn PDF document text
    • https://la-klamm.org/Files/files/36385594223.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hdffv1lca7tilfpit3f39bvrip/86409726232.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136050b3837e---45747771338.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6120b5810---96097488316.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/sanugemegoke.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/juresimimesogiledijesor.pdfIn PDF document text
    • http://flirdining.com/uploads/files/74211280095.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/73245663753.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145625587ae2---jugosuxog.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/sifujaxawulokigo.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/41108713634.pdfIn PDF document text
    • https://kondoreskiss.hu/term_extr/files/bomalikokagorefelirezivux.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/kuxuvejatosulibiwikinum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=once+upon+a+time+in+anatolia+english+subtitles+watch+online+freePDF 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_off0000b2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CE 14648 bytes
SHA-256: 95e0f44f8893584e2c16be4a907cfcad849f9bbc6c06affcbd438df02f9c55df
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 11276 bytes
SHA-256: 98954b7e189e65373cb41ad7fac3e279d148cce93751762fb6da54f0273624bb