Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc779147ccef12f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 22:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76e6a16f73ec295d85a563ff94ab7daa SHA-1: 06b4aff9ae02da6023f774e28ef3d88b0ec6447d SHA-256: 3cc779147ccef12f20b2c2444b85af9fd243b12051120a6c0ded1f6745b7c5c9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c42680b6504613403f083c731dbebf0/polowej.pdf In PDF document text
    • https://lengthening-sldf.com/userfiles/file/xabarugufi.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/3721150925.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/65478785376.pdfIn PDF document text
    • http://www.andreapondika.cz/file/68895712815.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/bifame.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/juxefevib.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/70227308540.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/78212616997.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/xuwasisijalazudurip.pdfIn PDF document text
    • https://elemonbg.com/Files/File/guwumifawenilo.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/mipigegofesomak.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/vunikanefuketowepudun.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/96002336140.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/rulekerizot.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/89699726470.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/tisalojiref.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/44948676286.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/88784502188.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zafozofovomaruxuwib.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/sewubum.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/50855324698.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lerugimo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613776574d9f4---28354772823.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c972b5cc65---49742250964.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+web+to+pdf+apkPDF 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_off0000bd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 10600 bytes
SHA-256: 804c36575dcd7455f881eee20de57265d6d62cdc19de0348af3c1ab41fc3ea49
font_02_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 17668 bytes
SHA-256: c7fcd5b07c11f6dc387f76d8a532274437cb7dc72f750a5c19498b181a5d7f09

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