Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4a4fd59e78ede8…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 22:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d57b1c45d94da15c2edd086efb6a9b3 SHA-1: a53cac536befced02e4322f761170245fe634650 SHA-256: 8e4a4fd59e78ede822e7040c6bbbde701fd5db9699e45723baeed93a5b8d0a0e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it is used to redirect users to phishing or malware-hosting pages. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support its role as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=what+goes+well+with+coral
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45851dcc9---zewoxopadagorarejif.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0e280c9d---41412224141.pdf
    • http://ever-pioneer.com/upload/files/49362413591.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/997c222b1fa4429f5c5aadfb1f6cc84f/favonidagerulan.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/45250534903.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075965c83deb---detejazuwiki.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc790b0434---mukujamegapoxoderi.pdf
    • http://accu-chek-event.com/ckupload/files/75763204585.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0251cb71e---subemaralisekipikojivuk.pdf
    • http://volamtuyetthe.com/userfiles/file/mafusafaj.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d980e3e0736---jasisepolobide.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c818faf412---7223476448.pdf
    • http://ramenzoni.eu/userfiles/files/78357854702.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a787a4a95ee---58068585950.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d772414cc7350b6431658e8f4b41119e/94163856513.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e15dc21a1---jagiminorowisutuvobukuni.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e870bd951e6f3feb65152dedbbfe41b2/zilodalopozen.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16236407456741.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093a283a3e03---38049248950.pdf
    • http://pelesiuvalymas.lt/i/File/20958298350.pdf
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/zozilutemujuwiwav.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a48ca93d---20033161500.pdf
    • http://jinshi66.com/uploadfiles/files/samevejebefujaxutot.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160755190b25af---29800448548.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b82cced69c4---kezogijim.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_off0000ea73.bin
7d706cd8fd29c3054e1f6bd0600262dc79e3260a0e16f669e9cf69d1cebaf968		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 17348 bytes
font_01_sfnt_off000117dc.bin
c554d861b4078e224eaa394c8efe42700aa18eee6a59fff6643d3401594bc47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 10484 bytes
font_02_sfnt_off00012fef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 16792 bytes

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