Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41d9e5131f6d0a4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 09:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e5cdcc14624f2cf0b2827ddb10d54c6 SHA-1: bc38074b6ebd95f448b5518c95cc5f835fd57274 SHA-256: a41d9e5131f6d0a458eaa449bd8fd0be7aa72fbc5d08f077e76b1a01e2d3d8e8
164 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 or redirecting users. Several heuristics indicate that the PDF acts as a link farm, pointing to various external URLs, some of which are hosted on compromised CMS upload storage. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://creteotels.gr/FCKeditor/userimages/file/74445270002.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d1beec962---19442691492.pdfIn PDF document text
    • https://best-label.com/upload/files/kivipikewonizonowuminelop.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/30676350833.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb278d7f7b4---biratokakonowasuxo.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/demimidajopujunifitow.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/87275102976.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/wevobibolaboruvezoril.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/wemus.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/61158661718.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ef73d88d4984c0be14bc2ebe985f03d9/zidozefivinabogegefedakof.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/xitolawulidofime.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/jepamamizigepukogirik.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pirjr5ddfvls4l1bojthug2c9f/86931543322.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/janokopazivukaxigukij.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/medovatejakudof.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ace3cd72ec0---futavuvejukepimevozone.pdfIn PDF document text
    • http://lenaoyunlar.net/calisma2/files/uploads/70095787553.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/banuk.pdfIn PDF document text
    • http://kbchina.de/upload/muxegusenuwebubo.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/13472917169.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd669c26888---42568724453.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cf863c92f---99969175954.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/vamedugezolosiveno.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/3478956828.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/3659347005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=possessive+pronouns+exercises+pdf+primaryPDF 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_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 18380 bytes
SHA-256: b21243be458e60be5925cd96dfebb90ba581d2b935b9775f20641ddb9ea480a9
font_01_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 11020 bytes
SHA-256: bf115cb4421fbbff867e06fce8048107129181b8f7c6185b3240964e8a15a511
font_02_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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