Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58f75146782826f…

MALICIOUS

PDF

85.8 KB Created: 2021-08-14 15:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 227ed3ccc397c0f646d17b407dbd2d5f SHA-1: 3e768634c894ac4b6ab2df0bffe28b98d6661097 SHA-256: a58f75146782826f13df62973f64a93cc2ffcb183e64cf4ebda037c6e39268fc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple external links, many hosted on compromised or disposable domains, suggesting it is part of a phishing campaign. The heuristic 'SE_MFA_LURE' indicates the document is designed to harvest credentials by impersonating multi-factor authentication prompts. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://smidgel.ru/uplcv?utm_term=how+transfer+notes+from+android+to+iphone PDF link annotation
    • http://wsystem.sk/userfiles/files/dofinolam.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/9375539685.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d0798aa2515---82528039264.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/mozewawoxusajo.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/merilobabilumuxejonozafo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/8061a14ba335a0479c9f013b591f286e/20525367915.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fn8omf5g0nahp173ilv8hrsfa8/55272580882.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/98268664150.pdfIn PDF document text
    • http://rayanchem.com/d/files/61339975277.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/8846475357.pdfIn PDF document text
    • http://slsnn.ru/content/files/litusutapukeburilo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/83666999689.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/lijidijaxudapamozusotafis.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/pa4udob86gu0t186de4018f3h8/39706463677.pdfIn PDF document text
    • http://totoumi.jp/upload/file/46545895298.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/rovogiduzobifet.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/64857790824.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/newududijazijes.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec2ea8a5d---35549325956.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210522103029807783ha00ep.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/00m13lttdihsb5rcil469jvt7g/nupipekesifale.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/gozimoku.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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 10792 bytes
SHA-256: 4e1f5ddaab1734a1a2b2b52f1e73f197a52440eb3adc69913bdf110faa4819c7
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 16924 bytes
SHA-256: 550920aca06e5c5145d0dcb898d6253a79b84863b0dc31c71303d0ebc369a212

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