Malicious PDF — malware analysis report

Static analysis result for SHA-256 57310065bd21f0a6…

MALICIOUS

PDF

71.7 KB Created: 2021-10-04 07:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d697070cf0c167b1495ef61039921d02 SHA-1: 1ef5d34870c2895c3cd333d7cb76ed4ec52744db SHA-256: 57310065bd21f0a6320ad0e6ef11c6b0494096c8c26478cdd3d895df6ccb3e48
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, increasing the risk of phishing or malware delivery. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://ketchas.ru/uplcv?utm_term=how+do+you+multiply+decimals+by+whole+numbers PDF link annotation
    • http://custom-mugs-factory.com/uploadfile/files/90358051066.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/56277926607.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/gosupevax.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/dujow.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/lefazogusezigudat.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/88259802311.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/1235326232.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210919_2FE3C25B6154BCA6.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/43340283998.pdfIn PDF document text
    • https://simorgh.it/uploads/file/14615278092.pdfIn PDF document text
    • http://maksimetall.ru/files/ridiwikavevamikowawod.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/24867114181.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f266ff09fd---98606050937.pdfIn PDF document text
    • http://kdekdyjak.cz/data/forejuwoxidilo.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/30196711055.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/78670493416.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d64646b1e2---fozivijalusot.pdfIn PDF document text
    • https://zhansq.cn/upload/file/nediminutisibem.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03cb6285d---20696261312.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/a49bc82f1cf699d53594cb30b3c86a53/jodifomegor.pdfIn PDF document text
    • http://saimiri.name/upload/file/mivunodewuxe.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/gotugawerolo.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/gojonilagafogapewobe.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/repipizudibexosageri.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a56693ab5b---musesazafus.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/45431679287.pdfIn PDF document text
    • http://shuswapfireandsafety.com/userfiles/file/60159732602.pdfIn PDF document text
    • 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_off0000b3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E7 16808 bytes
SHA-256: b033f511a752436deacf723bb1e267e95e3a52a7e1dd7a2c0cecfd9e0a447b02
font_01_sfnt_off0000df03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 11208 bytes
SHA-256: 759f77ce7f65830a34c52f10b82a4bd1ba6bce01dcfb41211de5c8ee99673805

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