Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab910e75163c414…

MALICIOUS

PDF

91.9 KB Created: 2021-09-01 18:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e751f3249ac574bc8bdf8fa282f7ad3 SHA-1: 88c832771c6b1305297f96d0e0f365a2d42ccfda SHA-256: bab910e75163c4145268113ea3bd33c5d06f0a28192bf08a011d5dc1c95709e3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://starsunited.at/upload/files/94976519925.pdf In PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/kowazar.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/18401652.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/58162183236.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/98835145510.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/gopuxirelebagiwuvoramas.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085762f2a9b7---45948993383.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0rpo4u60hf2jpfhod4kkv4q684/93563640490.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/86671574519.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/74997660917.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/pifazatudekiturenokujifot.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/pusira.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d26dc3fb5---buxixufijoku.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/54642441903.pdfIn PDF document text
    • http://oodow.cn/upload/file/210824072237055003w2zkigt3grgd.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/93336741242.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1e4ef576---lasaxotefili.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a9ed0c14---vatajizurafonimorasikoga.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160900858f1cb0---3005482125.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0af0e7938a58916b9941aea353c90ebf/nujutanakuxujo.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d189b7fccb9b04d568a43c6db501fdbc/14731384649.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76288149b---vugerugapule.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/99993523620.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/fadigotabulodawenufa.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c159fec8475---8175014431.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-8///2021831349452433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=knee+pain+when+going+down+stairs+but+not+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_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 17724 bytes
SHA-256: 22002915961b4d590bd84598fe846e05f8236d4b5a184e73f75f3379a3ea1623
font_01_sfnt_off0001306d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 10944 bytes
SHA-256: 9d3cb0c586073d173bd80737199403e67403d04fda5721dbae0e3828d70c19d3
font_02_sfnt_off00014966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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