Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4c69ffb011abcb…

MALICIOUS

PDF

92.0 KB Created: 2021-08-02 17:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c5f31d548d969952c78829b69ceadcb SHA-1: 7d4f2a0413b579c6552c2b1baf3675d8aa1cfbb0 SHA-256: dd4c69ffb011abcbc5f700930b38f673e24a0efe8eac0b3dd862c9b65af04940
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. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ab213d9c686a02855ed63351e52f4bb7/75321768951.pdf
    • https://bednidhitraders.com/userfiles/file/ranomubogumom.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c36a238aea8---91678533106.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767ac51ac07---5322443633.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/61183da0b8f34014d4ed69a9ce1f8dac/93407169060.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f2255d1599d---takidulodug.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d571bdc9f5---12844995483.pdf
    • http://akkoryazilim.com/userfiles/file/vigibudu.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2eb7c32584a011471d241b0a3f1c0247/82364066122.pdf
    • http://dges.in/userfiles/file/83325719798.pdf
    • https://agermag.ro/mm/file/57484315789.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e4a20e52a---71706869137.pdf
    • https://chmelo.hu/sites/default/files/file/49914845101.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2vmqvrr33dcoui3kptt2v79kjo/sisarokoditud.pdf
    • https://maturana.cl/upload/file/810024441.pdf
    • http://vorne-sitzen.eu/pcms/content/file/5197370626.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/69rebik2vdulq7ffnfm24rnvga/35141276565.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3a45fd1a---rezivojixe.pdf
    • https://alarrabnews.com/images/content/content/file/vokolevowevamoloroxatu.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7350c0d22f6955a921ee3cf99d49fff8/rafulexumenowixogusoku.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5b8736d9b---43851657900.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/cae0feda32f52b99992ea6f8ec0cfd97/runazotugomaku.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/21658040680.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48b5cc1f4---3490416675.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+change+chat+and+game+volume+on+ps4
    • 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_off000103de.bin
ee91adaea5107d6890a5faec3cfa094fd4ee8df11c2ae0299a14fd5ee7ed6487
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 17240 bytes
font_01_sfnt_off000130a9.bin
71524c5f71693647c34223cf95e5c06e22380e3b8315ff88f3268d2ca140bbb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x130A9 11092 bytes
font_02_sfnt_off00014a3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3E 16792 bytes