Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37a3f5828a44bf0…

MALICIOUS

PDF

114.8 KB Created: 2021-09-01 00:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ec8a1f4e0110154e066787bb9b2a6f2 SHA-1: 49325259bbf8a1aae17e863d5cf0b1d1af649007 SHA-256: f37a3f5828a44bf06cf0b4e1637e7391f7471b1d46753e1163913a6dc30106f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to numerous external websites, many hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious or phishing sites, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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 http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b98f88d7c122a305b96496687d280433/jejefarojaki.pdf In PDF document text
    • http://nhadatv.com/webroot/img/files/31700236170.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/35283115997.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/nudopiwegamobawenufonab.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/71769078738.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/mozumidiwufokejis.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3445bae7f27ba1c55c26e3bbe3f5d855/11257167222.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/bdb4c05641d74ecea6cea101249f2a92/30471571119.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i3ur2kfacu1f0ug34hhiv7rtvq/bobamofujifutugut.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/kakutukivemifabonode.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e953d1eb1de---pogiwudepevoralututodu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609604c6ea8d0---75235561757.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/us6m8vitihjram2f1hgod23544/90156218986.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7as5n69um395ton9d40to2hcdh/29567968537.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c9ad26b2e383010d8a2f74eb7f373e55/pegufiru.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/wipogutuxo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2fb070e24---11068299135.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/gejumibemitetifaxad.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/fasorevivopisik.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/60176185311.pdfIn PDF document text
    • https://aashianarealty.com/file/guwegalurisorumo.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/45627230023.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/fagudupejavonijidevi.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/52500279410.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/78309752789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=traditional+rainwater+harvesting+in+indiaPDF 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_off00015a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17218 10640 bytes
SHA-256: 102faeda683d65c25f3d619d5114f463009be33ddcc3f1bea7feeb9d1e552df3
font_02_sfnt_off00018a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A34 19456 bytes
SHA-256: e809bbdfe1904eaa91c26ed68b7e7dc61ef91ac164f47f66f64a2b6de7b3ebc2

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