Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3ff7221454ced7…

MALICIOUS

PDF

90.1 KB Created: 2021-06-29 05:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e3d702e6b48fba787fd8ade54037fa6f SHA-1: 90c7f335338eee35d7976f8c23eeb20699e3a008 SHA-256: af3ff7221454ced77acd60d9f7a72bc081ac8983857951a91237e4a2f85b37d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://www.jobsincrete.gr/images/_user_na/file/wagebuxomemarafusofates.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90ceaf026---49918301139.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/04f1b5140b7ecf9dc537261a447129b9/jurute.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/xaruxupivibobikebix.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/afvr39g766dfaqa0jafbk9b6g6/sakojegojagomexibeboj.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/vibim.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/5304d2982cf5603967f8fa65d639fbe0/12623966376.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/zefopag.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdb67b09e---86416184994.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/jegiwunesudavekaj.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312fcd5981---66082525663.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/56232376691.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0b0e49e376437313bb8b4b9949387e3d/memisu.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210518204650.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/bobipimuzinoru.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608110c5c9443---jokadagenamig.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a69ba214---50926452700.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/wagoripov.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ictn02ot082k3sd5r1lqfp5h95/85502314441.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xezakeboziwiwux.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/rubegubuwewopilibadidaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=some+weakness+for+resumePDF 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_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10492 bytes
SHA-256: 9ed13db6e683cc61d5e254d6693fa23c3cee81f3cb4d85e396df0974e079675e
font_01_sfnt_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 17268 bytes
SHA-256: 18a60246e4b8e0bfb534e84d2d87e50b1ee8bcedec33706585989c8d6189b52f
font_02_sfnt_off00014377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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