Malicious PDF — malware analysis report

Static analysis result for SHA-256 9472221272c7aa34…

MALICIOUS

PDF

85.8 KB Created: 2021-07-08 11:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6bfe8e329da05fab098cfcdda089e52b SHA-1: 70c366d0768bdee1d8a5fcbaf40634218e9e49b8 SHA-256: 9472221272c7aa340913826ad5ad9b6f42578faf83d70ac65c8f4da6df3c309e
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 websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to exploit users or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://meble-tk.pl/userfiles/file/duxokezaduta.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847db149126---88963788890.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kukoze.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/14695051920.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33f6bf313---kixukatugavi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/vigano.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/72110532895.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/marikegilenexogafosokejov.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/73600295753.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8b62f02d---botepipixododawurafafof.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/53720148932.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac2c2e363---kesokumepobezonorejar.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82c945f37---74453712733.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8s7at62f6c683hehuf66oln4q0/jegatosuzuzokud.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jt6gstkcf1naejp06q9kitkf5q/ropemaworosow.pdfIn PDF document text
    • https://camelcarpet.org/d/files/37648912017.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9rb2vk1v8udq1q4eb471llkpcf/jijirep.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pimoxilezenevekerebesadib.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/dekakoxuxifeginugisizedar.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0cad3926---xesanevo.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/37875852541.pdfIn PDF document text
    • https://rosycaffe.com/file/67810223602.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/vudedagazikog.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/27233293334.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/zoritikidoxevilemawunan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+pete+mean+in+recyclingPDF 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_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 17708 bytes
SHA-256: 18bafa0f39b47189732c28c4899a667dc6e258bcda8403dcf23e14813cef1b90
font_01_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 11068 bytes
SHA-256: c575f6027829253138f248934de524d6a4e318f325501fc7bcad0d97cdcb562c