Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc989c140af01fd6…

MALICIOUS

PDF

76.0 KB Created: 2021-07-28 11:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f4875ce987bdc90aea82cc2c5ab2c54 SHA-1: 0cf71ebcabc0b5ded4356a087a1fc641fcf30f4a SHA-256: cc989c140af01fd656cda284cda3d05f62e056f472bb949c03e6ca96cac37ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm, suggesting a phishing or SEO poisoning lure. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing indicate the primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://agriturismocorteerbatici.it/userfiles/files/32382958262.pdf In PDF document text
    • https://catbasailing.com/upload/fck/file/dotodutibamifi.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/pabojuboxi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mdfrlu6stp54sqjehsg20312fk/vewotufunulijuxix.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a18929351---11674961492.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8b4rvo7on86kkvqbkkuon8eoe7/96822485903.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/fexale.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/86356824268.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/o2rpgab3gu8kph66bku2p0e3c5/49852120361.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d005240de---37875691123.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/famoxonepififumiwulosi.pdfIn PDF document text
    • http://geose.ru/userfiles/file/59062466169.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/070b3ccc504c43ca9aec7f42a78a7a5f/rubaz.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7bc455b7e0f1004a56d05e643b545d67/tixilalokiwiviruwika.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/zadumugexitebubewiwepa.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/mopogodi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3f9838560fc1940f5c126a4c9655b3db/betigijudovaju.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5ab9c35a1a1fe5a156a323467993231b/74079237265.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/nolize.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/61954371715.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0545415e6b---23781744346.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///vejoladesegipalun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=harpa+crist%C3%A3+cifrada+pdf+baixarPDF 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_off0000c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 10708 bytes
SHA-256: 779621381f94cc3b98235e97d37729ae55875b8f06d28a81cab1a611b710e289
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 18120 bytes
SHA-256: 76817e849150746b8ece59994a6c443f88b1ea93ca72563ea9e587ecf4c10367
font_02_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1