Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f67c4e60a891643…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 16:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6efb34b5c2716c3a86e527e88c6483cc SHA-1: 6ca9bedcf3985fc6a9b381584104d1cdf0601da7 SHA-256: 6f67c4e60a891643ba08645a44e27c5cca840ace17183eaa0a35f6107a3c5ab5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external links, many pointing to compromised CMS upload directories or disposable hosting, strongly indicates a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=como+cerrar+una+aplicacion+en+android PDF link annotation
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/6351894851.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b0ab76165d8972658a5cdba8111207e7/ladizatuletekovokujed.pdfIn PDF document text
    • https://simorgh.it/uploads/file/52194610677.pdfIn PDF document text
    • http://futboltotal.net/images/files/doxojifopobujupexegudid.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/vasubotopukafijun.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wewotadelovifugiloresi.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/57109960879.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/98902152447.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/xelulusotuzirijolusu.pdfIn PDF document text
    • https://novsport.com/content/File/pidubixunubalis.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/ridukilobazilejen.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/81518396033.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/65058054885.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/64824315098.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/92884115538.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210918_124802.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/6211744226.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/71720054598.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b79a9035c7b0b5e86a99b0caa0b29881/41397897731.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/pufufusux.pdfIn PDF document text
    • http://swhos.com/upload/files/96713387508.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/nefulij.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/88138503153.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9tqafc2fpdl2q2kbl3glos4si3/9573626435.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_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 10540 bytes
SHA-256: da18574499a7ae6bae617999e38b199fe265ba79e88300c42fc83a6379db4cb2
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 19892 bytes
SHA-256: 3b3718eea2b668e2a927ef1865dfc8f592e51d22085bd3d37c6cd6915b0ee83c
font_02_sfnt_off000133c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1