Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd699373325aa8e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 09:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00957ac8a342a08c79b37976cdecc392 SHA-1: ded88086d9106780e2e094fa70e7cdcd0acd8fb3 SHA-256: bbd699373325aa8e8ba432a673006d11a5f2e3aa7b01bd53d4c4193a6c926c15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=real+drum+mod+skin+apk PDF link annotation
    • http://uniquehotelsolutions.com/files/others/motamedejepe.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/fusuxorudogofidanewimelaf.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/4100459524.pdfIn PDF document text
    • https://quizai.com/uploads/files/dexamoxutuziwopuvizijigun.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/liluxexiture.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/kotugivododegimabawolifa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8833e55c31657c58297c359e19b4be4f/98123521655.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387abde24ef---berunaxetadivilezot.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/204037947.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/86609871822.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/demupepigogavagexufexero.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/91269111915.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/80091073300.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/86526094030.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/zusaset.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/mijukosamakutuwexetejafus.pdfIn PDF document text
    • https://luminex.pl/upload/file/zodekutimir.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090501573370554.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/zuxewubagiri.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/72094368735.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/37605372071.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614112ac189a0---63318346044.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/wamezekilajebame.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/levoxekanijen.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_off0000c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 17244 bytes
SHA-256: ec32b0910dd952eb89d8bc338879b4aaa4366a4455b8ebc8b3a2a0eb92d19ff5
font_02_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10692 bytes
SHA-256: b6c2db144f23248dfe5d56846369e187912374db8b498d5e765d7adce365f25c