Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda3991bb32aac07…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 17:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0660410c26c9ac695247880bbf5fe29e SHA-1: 4f559d05b1511ffc2365e1a5bc5cd00f832c85f6 SHA-256: cda3991bb32aac078bfaaff3cc5027ce2495eaf803b66281bc3a5f2dcbe39a4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various websites, some of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://huntic.ru/uplcv?utm_term=best+what+am+i+riddles PDF link annotation
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1ffd784c36ab807b3a9706b8000744ec/gimobafama.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/jiwuwavarivudirinexas.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/89008088145.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb7ns49pv0fqoajl3m20t5s9pp/15405856729.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/40551482720.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/73427040964.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/75726907852.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/54f95e1d8ba96f5902d923cce3629932/naxosufo.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/83032205619.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/pasubikasekuxitubej.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/sewirenalekuduk.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/d26e8ffca11b29db0027e26547e54030/sivofajo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b350f74a2e2---55095749578.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b4c11a380623ed06f32558f4616e8d0f/pefenariketadubabelu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7911a705ab---91294214648.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/26133723643.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/24962026821.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/92559948640.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089a665ecb4d---56203723314.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993d1fa61a8---misubufemaxesudenunepete.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/48238865654.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9255b6c7fac9aba5d8101cedde43822c/dunidi.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/11676120955.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/23516887588.pdfIn PDF document text
    • 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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 10428 bytes
SHA-256: f80409267134ba65f64f07d6d7ba358c11b9f7f1099dcb59e91e992e4707c53a
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 19160 bytes
SHA-256: 7d3368afdc6d9d08a59ce81aa0bf48d00686f5ac12a3dd78338e57f582efdb9d
font_02_sfnt_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.