Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbf6c4bf65aeb81…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 00:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0354ed198572c8010e8c68e75df55c1 SHA-1: d36f13bf38c2a2d80c53b72ba299fa389cc02abe SHA-256: dbbf6c4bf65aeb81c78f5e2745970c4eda051a21ee8cd496e4db1a8a5400fc8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The embedded JavaScript stream, combined with the ML classifier and ClamAV detection, strongly suggests malicious intent. The file likely serves as a lure to redirect users to compromised websites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=tutuapp+popcorn+time+ios PDF link annotation
    • https://simon-daulte.com/ckfinder/userfiles/files/76379052339.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/tosulurajozew.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0768bf4bb---boduzaloxasu.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/24685740469.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/70740787742.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/njf0dh98jh8c82cr7bfoh1ll70/28756135946.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/xugode.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/92570793941.pdfIn PDF document text
    • http://bronia.org/userfiles/file/20734389153.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/89060762793.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84b0c99f1---maxot.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/87045455839.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///weritidilevu.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/30006992381.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/lusefubijaripofam.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/nufoxiduwaj.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/94204974216.pdfIn PDF document text
    • http://aven.su/userfiles/file/bukajuteri.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/59862611015.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/bisotepofasotalukalafakof.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/femufewugoxogonu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/nomusutised.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/79704918497.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/18765900308.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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 10552 bytes
SHA-256: cd215f33b01e9ee1de53d795ff608736cc776790388a111c09d6cf9752e225e4
font_01_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 16712 bytes
SHA-256: 98cabc2f12e3a72ecd2eb5556bf2a5cc3d6ca51c225f1a603d0743c1a5efeaec
font_02_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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