Malicious PDF — malware analysis report

Static analysis result for SHA-256 4581cfbb1c111359…

MALICIOUS

PDF

91.9 KB Created: 2021-06-25 22:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f25526926f7c8bf17a4fe1ffa2695269 SHA-1: c20f6f725b9df2750d02396ad8b94809ab95262a SHA-256: 4581cfbb1c11135971ec2a31d93f6aa2e6bf141b56f2dd34d7551469e90544d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. The file functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or further stages of an attack. The presence of a 'download button' lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ankaratemizlikcim.com/depo/sayfaresim/file/siwuboritetewepobig.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5kbdhqap3hs11b7epugk455la/35620323264.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a119846f022---dapufejuxexola.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/i0t0h15f6j8m2j9utug8lgm193/83246967786.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cefa7938a4---robenovis.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/49961734982.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kfqep4vr7l3mj765dkhj4mr30e/josavugip.pdf
    • https://arendic.cl/files/remazuwazupiteg.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092385b120a1---zakogifekumimemij.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac2bbc0002---63688974579.pdf
    • https://anfauglir.com/images/file/nezilimafiwugujukofug.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd81f36aee---76288651979.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ee64cbcc95e1a97503704fd3d5ef68c3/58309401037.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae2e89937---sujapasalimetulofomo.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/j9c57fioerh11832dpdafkv7pr/negifedovimidul.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/arlso4u8uao7ooqhqnrjeavs54/8659213100.pdf
    • http://rungrawin-itt.com/userfiles/files/xinekoputaravurebig.pdf
    • http://ptaki.info/imgekoprojekty/files/zesikupumemotuvewasibik.pdf
    • http://macabrey-luthier.fr/data/Files/relojakutijino.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a1b0aeb8---rajiwexodirudenikako.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a4fbdbf092fc3c74575c31dbfac4bc55/dukuworobivivigomuligebad.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c740b68a74---nudabatitigofipojefo.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160919461c2eea---78938137187.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=physical+science+class+10+in+bengali+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010172.bin
9467b735d79f159c1565b48b65be885eecf2ae2af6cc5629806f26dbd3a131db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 18080 bytes
font_01_sfnt_off00013116.bin
40ae31640b55653e6fbddc7c0f0a5760d5fc4230d9c7f3454949191966be9a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 11008 bytes
font_02_sfnt_off00014a3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3D 16792 bytes

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