Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2950632658aa27…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 06:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6a6cbd93b221e1edf00f59fedd21e9cc SHA-1: ffad835ddcc5a30ba7546bfe3bcb8020dbeb883e SHA-256: 4c2950632658aa27fed9fb60d99e8c9c98d7267a18fa92eb9b78b0ddeeb7e101
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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://drafthe.ru/uplcv?utm_term=cell+organelle+crossword+puzzle+answer+key PDF link annotation
    • http://manavpublicschool.org/manav/userfiles/file/bemumaregepakabelivom.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b06ce880---dugupasabusozit.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/lezebebajave.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2b1be7236ef59d50fdb97928675a5186/23928148273.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/lokidifurumexibowalo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7c78e7a8eacfd1afbf6ef61fa21fd2a5/loronajanikigumifata.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2d966122f1494ec36e27e2c91c51b76/77171741744.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kulune.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8d44cec7---jifegebulire.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aos92qu0oki617c0j00k5cn0p8/joserululisexo.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/90672014037.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/2e4d66786ddc885f3801dfad2f4cb520/46725723921.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2225df4c0c914fb354b0a423a8117ac2/guforixi.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/72587216013.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/belumu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/oo9e5fmi8ibi31jj57v3h25402/38891405232.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/45464306732.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/52778744835.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/86t5cfcqvkqja6hmum5jvdq4ht/15184290159.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160700d83714cd---31371778034.pdfIn PDF document text
    • https://memoservicesrl.it/file/benafetolukadorukidimelip.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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 17204 bytes
SHA-256: 6477ca94c7f666caa447d6839ee5b5ab14760417f40703deaeee593e6ecba8e4
font_01_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13323 10980 bytes
SHA-256: 28a1255bfda3214f5c2afb28e60ab8e441fec33544ced3be1694e1576e20c817

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