Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d726f9c50180586…

MALICIOUS

PDF

85.1 KB Created: 2021-07-06 01:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c4bd460be9491db2f4c4e4cb156c9d8 SHA-1: f9a0d75e94d6c64cb74efb99d74a9f678c67513c SHA-256: 5d726f9c5018058684749cea23f74a385a9e93ee82d7d87d24a64c24228ff472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier further support the malicious nature of this PDF, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=how+to+see+blocked+messages+on+messenger
    • http://kururlaub-ungarn.de/bilder/files/97114933765.pdf
    • https://immobilgold.com/file/57559989937.pdf
    • https://rybczewice.pl/userfiles/file/tidevibalofavemopukod.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e9f4a29efcc3c8130b80fe70f322993c/57007807196.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3da8b56ce---81745447191.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/938955b7552d3a302ed6bb17e6ccd625/danor.pdf
    • https://spotiverify.com/ci/userfiles/files/52354149840.pdf
    • http://abbwingslynnhaven.com/uploads/files/jemawi.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7caf1aff445e99e03fbc5120f03dc965/53182581488.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/nk6b1pmk3m6gmn34r77f67jb80/likinulanimonigaduravex.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/dokod.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e07bf96efc5c184e4c321e4a22ed111/34624493831.pdf
    • https://5udua.com/contents//files/54864574792.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4e91a9b1---88956371545.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd909771d3---62066691993.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31fde3521---xebesinikusejijetojadu.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a179e84ab4---47622123455.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d2d8a6e57---ditodavebolijowokovun.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a002594d438c889fccda6a3bbab6f1fb/nidusafun.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4bb8540e2---dalofidatutum.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3b24612c13c0055857891456e0d8851c/lunedibagujokevigu.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k2vh850053t9pfjhgk47r9171o/66002588059.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3141ec0d9063650c94e640e5f341274a/xedenake.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5049a3ce4---58400085752.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/d68d598b0bede261354a777f81ab4ce3/lugusa.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_off0000e970.bin
9833866bcca9d90642d97bcef4da2178d6a056fedbe331812e3fec9f702c2602
pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 16864 bytes
font_01_sfnt_off00011537.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 16792 bytes
font_02_sfnt_off00012d4e.bin
7eb8de02602ee8d950e9dd8d7f12892844517506a55e18a904e0ede423b41ebc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 10932 bytes