Malicious PDF — malware analysis report

Static analysis result for SHA-256 8796bf38fd0a7e0e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 03:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1de53d70290f0c485c93fc3fcacf654 SHA-1: 08191286a892b327c9e048945af2b79bbdfadabc SHA-256: 8796bf38fd0a7e0ea8ec50559e9d6fff5855612c893a312ac5d614c7b913eeae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

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://jpind.pl/userfiles/file/mabuvuxalolo.pdf In PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/kes2m7r9oadalgub6pjbrvbta4/23046422908.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/rulekotakuxexesigomazivaw.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/59571325975.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/gasadopomadurodi.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0498cf033d592414d1c8114e577f3c7c/62558747709.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/64110748250.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/off601kbn29ngp1odhmrhnmbfo/15319211600.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e4b377b5---79034959495.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90353c545---newekusirujaxujafu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8d8ade48---82939195033.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b932206cfb9---kitixugudodidibagigiwal.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/vusajirebigavi.pdfIn PDF document text
    • http://servmed.net/userfiles/file/66325059492.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/gaxege.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/11055941734.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f98ce7edf---kavoxudezimituf.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/89946654487.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/77083780486.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/22980785418.pdfIn PDF document text
    • https://hsse.cl/files/39448488313.pdfIn PDF document text
    • https://digicpictures.com/downloads/16823298687.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/kesetovekadaruxiruma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=toe+ligament+painPDF 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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 16516 bytes
SHA-256: 24c03ed131d198ef5764d82c6992180e7fa51ccb4ebf3e1c4220769a0ba43f65
font_01_sfnt_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 10288 bytes
SHA-256: 8514707e28bf9909542f2fdd8e73b83fce3843305113c387e246578cbb1f0ada