Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdffacbef041b64…

MALICIOUS

PDF

83.5 KB Created: 2021-07-07 20:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d08066140a542b1e7f50ce6e0c1773f8 SHA-1: bde9e0ff8b053567c3e7141facd2b19b88bc3124 SHA-256: 9bdffacbef041b64058ac063b80e48bb524c0910c3b18e7c0be2d02c30dcaf30
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=32+teaspoons+to+cups
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/80a2a9ce0018900993c4c67338f1ccb5/refuwubojo.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a3c0c0665239af0805d2efa3f3c3a154/5328276861.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/7d26898ce2f644f04b0b1e977b59f97e/41333343181.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607037dc64f50---91696486814.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073af246bb91---jesomegoxawi.pdf
    • http://geometrarontani.it/userfiles/files/ledugaxalirala.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-29/20210629092543498231.pdf
    • http://dobrasekacka.cz/userfiles/file/zimixumowuxegidafo.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ceb7c6f0a---vodaxevulewesika.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb546f2686---lefuzegineberosalese.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841b5e799c---wikok.pdf
    • https://clickkedai.com/userfiles/file/3515500097.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098f8aa0ffc7---31906404868.pdf
    • http://growourworld.com/clients/83159/File/pufitikopakimax.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f04ec60d84d80542dfd21a683896438/wawonuxomuwugijut.pdf
    • http://ckpak.com/fckeditor/userfiles/file/57998585778.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ee0dbf9159c4111c535e88b849b45c86/zolokatuvobudorajemo.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e3d36202---76263296112.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c0d8b46bb7458dc3a67f1d0d834b92a1/77264772075.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a17e3dbeaaeb7f69cfeeeaa1dc9e29ae/xejaxukitajaj.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f3f9263704f1038b845480190011165f/xuvazosesugexexad.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s939mrdv9atvo3rimhbircj2c4/kikebidoralusukanifubax.pdf
    • https://pacpartner.net/images_client//imagesfile/89882877913.pdf
    • https://topupdana.com/contents//files/30477791401.pdf
    • http://quickvideo.nl/userfiles/file/tubewat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e623.bin
d7c06ba7e16c236becc109577e0a028e07a61aa06706d83fcf7373c373bf44ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 16516 bytes
font_01_sfnt_off0001110f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 16792 bytes
font_02_sfnt_off00012926.bin
9c07a7b31e6cbd8a560214bdc277bb713f01cc3a659ddee4e73cf94ee0630c63
pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 10424 bytes