Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab9abed8994319b…

MALICIOUS

PDF

75.1 KB Created: 2021-08-06 07:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4b88737c114207cd56dc27eafe49e7b SHA-1: 3034da3a28b70297e6c9601d2464aeeecb80558d SHA-256: 0ab9abed8994319bd093d50d192f8a6e1e497045d2a981498f68e6587d2276a3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic indicates a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/udm0kt5kefe2apgp1th2b4cj74/26808314192.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161067ccc3706d---4841195594.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/famul.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/62188744874.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/zegevetitagilemimojo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/xobumawutug.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607776fd472b3---latatujixulibigubez.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/vudogowaxixiletejabadeb.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa177dc22---gojebatagimekob.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/guvewari.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44768ea09---42786943923.pdfIn PDF document text
    • https://koratspring.com/upload/file/79112639459.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/77dc5f507ee7d447165b91697f913175/62417513541.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zugizo.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/29842903661.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6177593c7ceab597d8eb0d029bdc295f/75719626191.pdfIn PDF document text
    • http://amdind.com/userfiles/file/24444155123.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wojatesesidamefapofores.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/diguwasodalimuzo.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/17423263038.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/70807220640.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/f4pprlrn27i62spgs5ib49hcs0/3561382229.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/nidenivusobudomovubix.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/83877760704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=easy+battery+reconditioning+reviewsPDF 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_off0000c25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25A 16224 bytes
SHA-256: 4c38f3a6cc00a2fa2f46642635a4e1133af998d9687570a500d2a80484f5e84c
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 10888 bytes
SHA-256: 4c03d32bb9a64814e26fe8bd1873106ef34e4565d99c59ef25a784d6d3a8baaa
font_02_sfnt_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1