Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a602dec011dc701…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 09:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14c63b240fb0bae872990add4c66306f SHA-1: 04f8370c327d55cba63785dcd8cf98c0907c4061 SHA-256: 7a602dec011dc701e731f09ef7e8b6a14ad54394c9db67ae1cad41a47fb22307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bharatbiodiesel.com/userfiles/file/62346362803.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fab7a309ed5b3d13159252bc7d3104b9/74803544951.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-25/20210625220844743064.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fdba3f13dc57a750b2cae9db29d6673e/74818819299.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/zezewubexuba.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/3920649843.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/33227303128.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/zojof.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/tavowagiral.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6b294934cfbb9186b30d32914a670ab8/xisilezunijinorivopuvemu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/afe23362f5bc302e4ddaea2c9827dda8/lebimesiludef.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/lamujijitowewujatepe.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fcmketdlinq9mrfbkjvjua12v6/62758590704.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/44417915999.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d9aba3ac---34834633329.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/97439796118.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/74058446784.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/jugolora.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/22607e79298ebd22d0430db4da1dc763/jegot.pdfIn PDF document text
    • http://sivam.pl/files/file/18349116442.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/bakavanitoxogutise.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/jorobikunoleduza.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/253779f00269ad0c126aa5021ef22558/siderebafamaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=subramanya+ashtothram+in+english+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_off0000b00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00A 11372 bytes
SHA-256: d85c63209ee7bf7db51fb3cd99441c2a4c12df69d90fd802cb3e4676ba3b42a8
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 17452 bytes
SHA-256: f9a3801d80978536b04d512fdfbee9ef6b689b112385629f96c460a91746530f
font_02_sfnt_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1