Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a71539962c3fed…

MALICIOUS

PDF

91.9 KB Created: 2021-06-26 17:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 634c2046db72245ff64c761c63a12dd3 SHA-1: dbd523b9ea30f0218f2097dd34924c4fb2c59a3a SHA-256: 23a71539962c3fed4aefa22886132113e965495afa7e958f4bc6d34d1c15cd36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://medvor.ru/uplcv?utm_term=where+does+your+love+lie
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/6igctkf0519usg2mppa6e1vv9f/nosilipenizorigatetasikit.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/98025e0e12f82a9dad0c7c50f87bed6b/kapuwomafagexibamebi.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3da9545142---23149159669.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/53035e4d9e3ae930e5960c77715e3c39/tunerokobaxoxexafubatew.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/e0r3bgpuo30947jq40bh1u4561/xamilupunowovedotorelo.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91f1518f05---81228111047.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b387344d5051437c9dc29c1b27a3409a/84202187865.pdf
    • http://techniq.ae/admin/uploadfiles/file/mapog.pdf
    • http://lohs69.com/clients/82366/File/14860015610.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d54ee13fa3ba1934c2ce6aa3160b4a23/65902866931.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16070ccaa71437---34111504511.pdf
    • http://hakkabrothers.com/userfiles/file///257036636.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mu8hoerubq0drer5sg61s4v2e3/vajofagikafamuvifinaxev.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda2c58931---10103838374.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/926cc18f35ef6f4c78b46eb82ab80e72/lepujaxudox.pdf
    • http://laweasy.kr/userfiles/file/nupolijejasakelibudawisu.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26b1a0d65---vuwonew.pdf
    • http://bobiniauto.com/userfiles/file/fojivexojixi.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b354a97ed3dff12a0c0bd31dc16d65cb/40827159307.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608939c35cb50---jufejazu.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/c320424017573be357d37351c9df938d/36708077472.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69eef6b69c1e87e713b904e01819a98b/ronezeronafupu.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9fdad3c7---tobufepadizezopilekurowim.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 16792 bytes
font_01_sfnt_off0000f95f.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 16092 bytes
font_02_sfnt_off00010ea0.bin
6df5d103e473770c885646f31049a1ee7b6772bef495e7d729716b8c30b67f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 23188 bytes
font_03_sfnt_off000148ec.bin
668680fc22b0d5bc4cd7436de7940b7ddd3216294d99f6eac75f68e37082a2c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148EC 10256 bytes

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