Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e8c7ed014275da…

MALICIOUS

PDF

109.8 KB Created: 2021-08-21 03:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 967732a543ee083421bffdcbacf34510 SHA-1: f381900b12615ee3f37000faab4f20d20c304bad SHA-256: c2e8c7ed014275da071ab50fdb1b16c21162921d92aa9d066d809fd28615e92b
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to potentially compromised WordPress sites and IP addresses, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083a886a3656---kiwibuzaxatorifadubolaves.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e8ef7adee58f0ca675a020e81e11b893/tilefuwojababumidipaxawi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1e5a2e60f92bc70121bd3ebf931cc9df/43741067167.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7abcdc59e713d9638d93d05923c2fbec/mawonowewopaf.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f0148f3d9243ddbddb38d698ecd6dddf/9554052901.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7f932c588bfdf39b0089b8ac4a5d1c20/36478206081.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/taxomemizadutogokideje.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16086169c7f469---51165888252.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609475a766777---refim.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/47126095593.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/setilivaxovurinifavebezat.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/91656509183.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tapenumewidisobofenadok.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/55118933024.pdfIn PDF document text
    • http://tyextractor.com/d/files/rebagudofamifejewafi.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/37013024761.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/39771224135.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/taviwos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca416e3a46---75938167310.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1oo6tuu8mlsn7qi40te46p0cia/77941469576.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/78d14b505bf6e1a0278674c845f65b53/visofovolekowur.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/93133124252.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120441d6040b---35893602213.pdfPDF link annotation
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=giant+food+employee+handbook+2020PDF 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_off00014706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 17600 bytes
SHA-256: 03eb5a7fd48c798550825dc3dc4e819062760c262017f65df4b724fe189830b5
font_01_sfnt_off00017519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17519 11124 bytes
SHA-256: 84a65267dc3f32f23ad065ea23aa63124d31509b287fefbe6868c08fd25f4d35
font_02_sfnt_off00018eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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