Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c600681d4e84cc…

MALICIOUS

PDF

80.8 KB Created: 2021-08-13 05:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2cb34d1bc453f60a13fb969047a539ad SHA-1: 6e4361e6938095013558d1445c660fe0674af915 SHA-256: e1c600681d4e84cc472f1397b44483d922404c8cb3d8c6179fbe117c0440a604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links likely serve as redirects to phishing pages or malware download sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://vita24h.com/uploads/userfiles/file/90203154478.pdf In PDF document text
    • http://1night2day.com/ckupload/files/69148638752.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/75552830584.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/zafizimokaranewebu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/fko9l6fs4007jb9bks117n2mtb/85757435348.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/1731160913.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/35805647361.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/8c20cpodtsgeauco6svseptost/32261286494.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/26609958905.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1d62af8bf9f845cfab08a79a45f08d7c/lidos.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/22626303756.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/domeganelila.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3071819e16---wijedojomawixiwuv.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0tbk1tbtvlk1cgfnvcm0mt43n7/5361017534.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8fe47d633---82747924659.pdfIn PDF document text
    • https://daismene.it/file/45415080873.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b292dcaba0---25270828886.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/7db8a708b8854b7b607d511f74bf46ad/wewufukupazenulenoxibap.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/siben.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f881bdda9---10881927751.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/7312640190.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/37dc58010a7357965daa4e7394bd49f3/11800829410.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/kokira.pdfIn PDF document text
    • https://peterdegendt.be/file/58738289165.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/474ji1efenq41jnbckrpuo6me2/limoxaxubazijajan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=numeri+ordinali+in+inglese+pdf+eserciziPDF 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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 17192 bytes
SHA-256: 57fef168ce0a5b80d96f9d72f37bd01ec44ad9ff389187b454ac76b5d3061414
font_01_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 11000 bytes
SHA-256: a36d9771029989edc21a5830fca4f8b480875dccd8d746c7566259d84dba258b
font_02_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1