Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ccd7a9eabc50cd…

MALICIOUS

PDF

124.0 KB Created: 2021-07-07 22:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b8620d81f3ed3e09f9f5fe2504ce5e2e SHA-1: 05e54c734143c8ac11146e6e1db0a2ad21eb189a SHA-256: d9ccd7a9eabc50cd3b996ace9d30d633cdb55217a486fa70738cc8689af5dd7d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to a malicious destination, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://kingbikeonline.com/images/upload/File/25551809250.pdf In PDF document text
    • https://mariellatriolo.it/public/file/sikifuvuka.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ooa1a9878pvm37nnoglkdjq7q2/36431542060.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/260bb2b822dc2df5d8aa1be475e464a8/73174355777.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608887ee984b1---zomazuwipifuma.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f42e9418---tumijurulovapivusuleso.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jpg839s840urtu3mi74pf9p1sf/zuwutufufatub.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/i8ahn6qok2j8kr2bti0h8nasm6/betinolig.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8bed9f82a2dcda6803f0318b51b264c/81719269533.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bejeketaxomoruladubiwosu.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/garekadinigixitedebalumo.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/9754665342.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/0b7hnl3kcaf8c6u18of1sf70h1/18029488530.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4b048535---79738732667.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a101361a7---67920734974.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d495deb7f85d08b58fa218d8bc340a48/9611553511.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948deb2f7ee---59511237511.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a7bb43c62a7d8f45ab0a90e3bbcb60c3/boferixedifudekufilesazaz.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1ac9abb6211e282e50ef4f449866ad22/gaguwezewaxerik.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d0d2f31ee---8816662257.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be14c827d31---golikuvaworunivufu.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/jasemiwumosepowinej.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/857eb2a7fd2bdd20e16c906a3649d53a/lanex.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160852382c4272---mikotapatobozuserirafefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=critical+role+playersPDF 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_off000181a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A9 10408 bytes
SHA-256: 75af4807e1d90a0ecacca56d7ae2113a106b24c51b8d7293bdcf916bb30fecc2
font_01_sfnt_off0001996b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1996B 18716 bytes
SHA-256: 941e82c551a8613fbc0618fe8dfaa96aedfa98f78a87dc806a308d4ee7d375e7
font_02_sfnt_off0001ca9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1