Malicious PDF — malware analysis report

Static analysis result for SHA-256 697fda60c279ced4…

MALICIOUS

PDF

90.7 KB Created: 2021-08-10 10:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb75cdf52c5dfc27347983586d341fcc SHA-1: a1368e50e280df7fbcbc1a86e69b7acc500f846a SHA-256: 697fda60c279ced4d652f24a674c1803a482496064523cd8d2d561bada830dad
204 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. It also features a high number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://busankid.com/webfiles/board/file///54632309459.pdf In PDF document text
    • http://www.lnk-creation.fr/upload/file/81525257409.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160955aab606cf---45069380121.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/pofowumagamajapeperonifu.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/voridorolaliwexeb.pdfIn PDF document text
    • http://mebco.ru/images/file/vemumajatejoniwutobif.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/46701770272.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3ac8672a0b95442f5a12573fe332fbf9/wuputevomazixusaximedafa.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0df402c3d4---29683609179.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc274d11a6---62571992331.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/51310411216.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/14326236092.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/popozova.pdfIn PDF document text
    • http://htwy.com/upload/file/87679225591.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abde2ed799f---punule.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdda6cf54---tovimi.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/janotijumewob.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pqbh09vbqg3co48in2iq4fe298/58185144443.pdfIn PDF document text
    • http://simonide.org/userfiles/file/1780016276.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d66c2628de46f89721da727ff1592831/16125197296.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5376be5b8---zorakaka.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160907969d406d---50597569772.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/joxixivotavubebuxuzum.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/07nkdrhjh9pti4qp4acrkjp70r/zezodisuzuzomuzovo.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/21535465295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ingilizce+ders+kitab%C4%B1+7+s%C4%B1n%C4%B1f+t%C3%BCrk%C3%A7e+%C3%A7evirisiPDF 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_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 18932 bytes
SHA-256: a5e70d10128219f15ffcc0f40defca79cddd7844ad29d17b3a2d5631f601ee3d
font_02_sfnt_off0001406a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406A 11324 bytes
SHA-256: 85204a954213802a87fc61a2ed857b132efd151e96773ced93ac9e9d4fdd867a

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