Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc10ceb67a9c97ef…

MALICIOUS

PDF

90.4 KB Created: 2021-07-01 15:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cf159b5847a2777d950deed4574fffa3 SHA-1: 97e022e7883b56566686f8d2bbdbb29f24330f1f SHA-256: dc10ceb67a9c97ef692fa46305163ee1bd2ed05130a1328d95e6b11a96135388
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://sicilyontable.it/userfiles/files/watujusexafotugopebe.pdf In PDF document text
    • http://cellesekorea.com/ckupload/files/31369564783.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fc2d8d6c21a1217e055647f7b0fa46b4/28083187921.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1020d01de---voxigigufojejo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/74732334911.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/amv9e40l9v25ngik669uebp2n7/bezudifilufejorumalagikip.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kesudewotojef.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c30da6cf4---84629922526.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1674e2983b---kizoxabokuxonezofefod.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e11a40f7d---robitipezazoguwazalibo.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d45f1d1e502151b59831b1839fd45c3a/35852283511.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/pesepepemudefoso.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/sokezigamabe.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/37723924519.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/64970243467.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/maporoladodet.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/3349274060.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/jefetodinamexox.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607894157df40---84657052309.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091f26c932b1---90468583694.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/12379439900.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91c150521---sexikexazit.pdfIn PDF document text
    • https://medtek.vn/storage/file/tevogisorakifakemopam.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2ac1c8bac32de93e14602a3f47f82247/pitiravexumoxigaligelomir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=frequent+indigestion+causesPDF 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_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 18504 bytes
SHA-256: e8ebabdd6f4d5f00a53715a10fdf929ebabf04dcbf05d4594f214a62a3c50c2e
font_01_sfnt_off00012d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001455d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455D 10724 bytes
SHA-256: b18391a9db286bff0c29004fd7d2a0337ca828ce0db4445faab325c02b7229e7

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