Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db8f5bd4252ec0a…

MALICIOUS

PDF

76.8 KB Created: 2021-06-27 23:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50ad0f9ea0b8dd83612d3d8a7cd847d2 SHA-1: 2f460af6f88e94778a5da42dd6e22e060a58f1ed SHA-256: 3db8f5bd4252ec0a5a7d98012fbd176f19253b223281bba4f8439027b53c827a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's used to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution attempt, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/af1ed7c5ed31d150aa06c545cea38081/87057350072.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce376c4853---fisazenadodusi.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/90n14pktssiphs5vf66pske5eh/74616116293.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/53386531667.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8d24b29c---zekivarejasipefowusezos.pdf
    • https://decoveinvestment.com/userfiles/file/63812022691.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kfbrouki17r2ll6qlkvgqm28v0/33543881920.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/jawoxewumogoturad.pdf
    • http://skybuildinfraprojects.com/uploads/lekafujezopugiposasazakoj.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/af116cd12c602fcc70c25f52fa6b479b/tavetatogulosad.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dd7644fbc---94580122417.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ff68b4f73073208c1206ff845505031f/79289600167.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2771c47360bea7003e8a564700bbea54/63234529153.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/27bd54358a5e522840d01b851af997c9/zibibigaguxiroti.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec4f6d403e---rorofoguwag.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c23d0f39---60986540095.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087910b88a24---32757066414.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee0841afc.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608414df8760c---nejezesog.pdf
    • http://bannermaul.com/userData/board/file/76091149934.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37461085c1---28831452370.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/74812696968.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ki0r5u5qh1sfu1flc9nthlbtuu/fegelibadanesof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ddw+2020+abstracts
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/17ea03ee350b3b201ffb5a8a91ca5a3b/masumazikedumidu.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_off0000c76a.bin
893993b3ddb8ccac1fab9771c7ef5bd82866334c81dfd19bb545f01ec9829dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 10336 bytes
font_01_sfnt_off0000df0f.bin
aadcef0e854d30367b1e915cc56eb139e321e27e18123d477746ccb81ad0dbda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 17960 bytes
font_02_sfnt_off00010df1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 16792 bytes

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