Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cf9d6622b6ef44…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 01:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58f9a77ebdc1532d82c7c48689941451 SHA-1: 1a6a7584a1f536b7dd3e0708a04e3efeed223c4d SHA-256: a9cf9d6622b6ef440a55fd45bc8c40bce0e02b9be684b2d505c4bfa00fd1be09
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

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 http://aklond.com/UploadFilesfile///2021060911365575.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/27fd78ad7e6404a7843b36d09fc6612f/85896915724.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c35aa98c---bupumes.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210531_B02398E9EFE37C21.pdfIn PDF document text
    • https://anakmeong.com/contents/files/30103519000.pdfIn PDF document text
    • http://slsnn.ru/content/file/6924281707.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/70301656987.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/78793744849.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6e9b0c7aaaea889ee5dde4c45f454a50/zedotogex.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b49b56d0b---vizidakesunanani.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/72309167667.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8b4e9dbb0c4612e8b6b23f13474abb22/dutuvabadubidokimuda.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f0d6dfbd---3723635989.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/linugulawali.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/gatusipavizojaveked.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/gagewow.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/zozadiduzog.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131bad6b53c4---jipuzisipo.pdfIn PDF document text
    • https://fivetc.net/uploads/files/tikoviponuwigapowofimoj.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/4479489528.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dtlljksk5tpeej2ru6a2tfbom2/wokojegelisumonune.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/80010dea54c07dcee6973c5a78c8e1c3/rojejaxupijiguturoma.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/34756104924.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1628513855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=honda+wave+100+wiring+diagram+pdfPDF 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_off0000b740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB740 16108 bytes
SHA-256: 1fe9382baf28aa8acf42b77783008d0478bb3889a2ec13d7a3d2e76426a5d7b7
font_01_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 10848 bytes
SHA-256: 27bb4cb4e65148cf8d49d9eed1af0ccd9c34009c9c4d3c6bdcc6e3f2c7099bd8
font_02_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1