Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1690908268dabee…

MALICIOUS

PDF

78.1 KB Created: 2021-08-22 03:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e39d38e30cd998e1e2c870ee59166e8d SHA-1: 20b78bb3ad3dde7c1453c49a3ce3d4e3e7e2a408 SHA-256: c1690908268dabeecd58f3cfccf8b192c1d9ae1fec215142f80e86ec5ffd6bfd
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mgvefhj89kign1jaanm43cmkkd/muwumipurevadiza.pdf In PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/30140352054.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fae075337---vewiwunepetogevifidosen.pdfIn PDF document text
    • https://mfdesign.hu/files/file/susuxi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/mulegukubedevosej.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/85848892838.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/xizugisiveja.pdfIn PDF document text
    • https://esz.jp/img/editor/files/tewokizedodudijonediv.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6f7dd9591bc1a118e2e18d54a47c9818/niduwepo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4b43825ccdb9934920aa2824d2eef26e/sepepitepu.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/wexexug.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/54682536080.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec20909dcd---bagunikowugalitosatu.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/37368936386.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/matodedewegapiw.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/4770158175.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ce768653c1096c2e7c320638a5a0b3e/valoxup.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca815ce05a---dewinilunil.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210806_5AB39041BFB5AD46.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d21a3aee07a---kapokosererowiw.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606e408b8dd44---22339490105.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/marutazaza.pdfIn PDF document text
    • http://ipublicity.cz/data/file/52357480539.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/nceh96m5b2lo3g39utorr69fnt/puwufunozixipamajejefu.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/rikovexinikera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lego+boost+instructions+frankie+the+cat+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_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 17284 bytes
SHA-256: ec863b10087e34dce3f4a35196bc31fbc372c5947bcb05d688c5e1c2006c6b2b
font_02_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 11144 bytes
SHA-256: ef281a6f1e52354b49cac26854d97e5d23cb540baa8d7ebba0ca6338e37202fb

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