Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65f62028cb4201a…

MALICIOUS

PDF

75.4 KB Created: 2021-06-26 11:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 625b3d9939d6987e2aaa3f10d42b4134 SHA-1: 2fde59e403a454832813b1129c76abf04c6996b3 SHA-256: c65f62028cb4201a05aacd344809506b62c210198546094471fa68b29278d52d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting further malicious PDFs. The primary goal appears to be directing users to these compromised sites, likely to facilitate phishing attacks or download additional malware.

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://philabc.ru/uplcv?utm_term=calculating+expected+value
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/khe62fnlc418kd6c265jrlbp59/22663573349.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f85daac87f---suzowinuj.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0na25t88hf6tpg45qnr9l5hns3/63911901386.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t6ctf6747j6u559lbvu5firmp4/29749790289.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/23mvrvrvu2024icnqlenq8g2js/71362339185.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82fe78fcac---zogepinazitujapokopoti.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1405b4c3---78164728555.pdf
    • https://petala.gr/userfiles/file/7689144353.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/u3qtdb68pj8smhtgcm8dh3ho4k/36319508463.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48582b5e1---76052237379.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6a2b13604bbbe984d5dccaa917a09746/tarorisubuzitexafa.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb26c9923e---70987458405.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d2b32433---97316799509.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7399a51d99---19670462656.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf1e6e05f---4781749752.pdf
    • http://www.logomarcanet.com/userfiles/file/ketifakixikusalabujono.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/07efb2eeb145ae837a1462a103ff796c/kuxaxekejibif.pdf
    • http://braciszewska-klimek.pl/fck_files/file/vopebib.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/f996253450ba1af4aa70bffb3cbedb96/gelowunabuvopapiponega.pdf
    • https://sieuviet.net/webroot/img/files/finifekaxisotojuvamutome.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/09d57d4c9131e62b063bdef61cc25471/28799516519.pdf
    • http://stepasidemedical.com/images/uploads/file/30496883422.pdf
    • http://sloplast.com/userfiles/files/sozesiwarub.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ickddb46cku1nbf76ad468i204/62810479220.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_off0000c478.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 16792 bytes
font_01_sfnt_off0000dc8a.bin
ed5425eb3718e854972f30efee11e0b938feb72ea374077887ba44efcbe34de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 16740 bytes
font_02_sfnt_off0001081c.bin
ab08462b939f73867fd78e482d1ff2bdc3e3d6472094885c9650e3f71f3fd3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081C 10600 bytes

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