Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe997bbadef4230…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 22:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d59e7259695dccd0427fbf0dcfa16dc3 SHA-1: 900f003351ce08cc5021ec6d56f4f3c68022087f SHA-256: cbe997bbadef423045dfb493374260c03978d521467204a2fbfec702e64f76a7
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 websites 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 delivery through these links. The document body is unreadable, but the heuristics and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dacinsara.ro/fckfiles/file/pegewikilog.pdf In PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/43923811631.pdfIn PDF document text
    • http://armanetti.com/images/87960727382.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/87992811098.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/fenuwa.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6o8evguk7m9vpgkmrumi4l2khi/sevutuvisegapitunopiladu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161004dabe5881---pokadoropoxiduwir.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b2dc5a54a---gadixiba.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074804f81da3---gijewigofu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121c19c14ca9---zobepejinujelinojedaf.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/is91aburaok3ju9a2gp51jnjn5/pufade.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/taxesalexututifabe.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2c82db5e8437c8f3693717435df17ac7/38328269856.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/mafulusexirekegexupimu.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/18597300836.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f49827c2nk7chr3jsms6qrl9l0/66204544219.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/mibifij.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/9065406689.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/kigugogibuvupenojesud.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/90324625921.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/53649827616.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/nn7mm37g1psbi3f6dl3smsf0ih/85025670364.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210606183245_t464vm.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5fc4e27a---viruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+screenshot+a+snapchat+picturePDF 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_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 10604 bytes
SHA-256: 66c9738ae63beaffa10d67d57ac298709b203cd055ad1ab5594b0ed21c96ff07
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 17308 bytes
SHA-256: f6d813af43918ce0b083ce065f9ba23ea9298f4f1c17753809e4a0242eaa1f74
font_02_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1