Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3256ccc408e574c…

MALICIOUS

PDF

125.6 KB Created: 2021-07-06 09:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4abe6d98b2b6f8128283f183636698cc SHA-1: 8e9c7fc7634bc9665be3a3c5093f43f816bfeac3 SHA-256: d3256ccc408e574ca978faf44c764f85e79d0e1d7ea381b0931b638e054eca19
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document's structure and numerous external links align with techniques used to distribute malicious content or redirect users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://rumahbaruku.com/contents//files/polosatitosebepawepoxe.pdf In PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb871032740---sugubuk.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/bojaxuvavulurifulagekan.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be61f96091b---61281446062.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/39123134020.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/gewirafetavefufefalidaxe.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tovudixo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7a07314e6ccc1be7c027c5efdaf5871d/60120213110.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/jokatipexubopede.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce1f05ac57---78021765313.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf24ae3c3cbf4bbf05551ee27f339da8/90355170359.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/023e507d913fb8376e842abe3407e61c/vafarilevatazofibenefu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc71da313---61793489324.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/34643147115.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8ac2f6554f6eb27482d745fe4e11ce5f/lazisuxubekofifodile.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/ramuzenakojugexo.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/67068346260.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/7qlcehgi6nqsggabm6l1h7m6j3/kanasideti.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k2us8e94rn38esi9d3ojo2co84/93541027056.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vp47jo9ufobjm71onignl0v176/birixefaf.pdfIn PDF document text
    • http://www.puhito.hu/uploads/romekidipezonejerapewi.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb743ffe0---gasugamuzixopel.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/suzoxigator.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/tvtubf5jpq9hob0i81c0mij666/67381833437.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d3c4d9e08083a9ed764bece32198222f/27868135413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=smallest+country+in+australia+continentPDF 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_off0001868f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1868F 18368 bytes
SHA-256: 74f93dcaf592ed5757be78d7b86eb9943409839cf503ffccf693f06bb17d82d1
font_01_sfnt_off0001b686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE9D 10680 bytes
SHA-256: 9b4aa6029a951b9c5b1cdc87bff5483d8014c2bd32f8d2b1d8db8219a8ab23b3