Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a22fbc04e24e94…

MALICIOUS

PDF

87.1 KB Created: 2021-10-05 01:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5bb623c4c2261fa247a4800f35ccf25 SHA-1: b084c8b26542292ea5928eb2c012000866823440 SHA-256: c5a22fbc04e24e9428c10d98f74926b21fb96b28d9f86d95c1fac6c09045bf6e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body was unreadable, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/g5i1a5odk7dfi6v3vsatip0f58/xiwewuvo.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/sizulavugewiwazivuvemak.pdf
    • http://timeyear-v.com/userfiles/file/duvufedokibokikuju.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/waxezitogofik.pdf
    • https://alcoquimicos.com/ckfinder/userfiles/files/7269193563.pdf
    • http://motorlustor.net/userfiles/file/pizewa.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/vuxusojasunalakotozoji.pdf
    • http://banphimchuot.com/userfiles/file/korapotoduzutigurotuwonij.pdf
    • http://autowassenindex.nl/images/uploads/99248539844.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4m584jasvele8fanmnrtpdenm3/83054612958.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/bimesagidoji.pdf
    • https://cabsfromheathrow.com/userfiles/file/lutib.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/zisujurodafumowesovug.pdf
    • http://pwharrison.com/userfiles/file/56048915063.pdf
    • http://tencanpowder.com/d/files/85003080373.pdf
    • http://hissekurban.com/resimler/files/fujes.pdf
    • http://gmart-express.com/demo/uploadpic/file/vifasumuluses.pdf
    • http://toroisg.com/public/images/files/77601656479.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/rkblokbjnam4f2dktis8ii1i04/votaduvuxorufaxijuzuze.pdf
    • http://kokocurry.gm/userfiles/file/27805928478.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1615815e25735f---38305230818.pdf
    • https://specializzati.tecnaevolution.it/dataload/ckupload/33565287661.pdf
    • http://seoulmenu.com/uploads/files/51377819729.pdf
    • http://elateridae.com/images/FCKeditor/file/55872502159.pdf
    • http://sakem.org/userfiles/files/94227073685.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pete+alonso+mets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1a.bin
11dc5c5fc4ef14790facee1d48deeccb7d0aeba22a158868f38ba181cfc873e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 10076 bytes
font_01_sfnt_off0001039a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 16792 bytes
font_02_sfnt_off00011bac.bin
1f2363d1e5cbc75805fe54b3ae7b3b3937c40ccc121d68c8c5001926716b44e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 19848 bytes