Malicious PDF — malware analysis report

Static analysis result for SHA-256 5560ed4a1a393096…

MALICIOUS

PDF

87.3 KB Created: 2021-06-25 23:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0307eef84a0484961565b7c2d678db1d SHA-1: bada77ea5a661e517dbb8ef874a72fd5de9705ea SHA-256: 5560ed4a1a393096a084ebe71affa9ee6c8349e46b7842f157fa0212104b1727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known malicious PDF lures.

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://philabc.ru/uplcv?utm_term=queso+in+english
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/24335b2ae500b23daa8d575e945c5e42/xinowemepovutumed.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/14721132735.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860008a175f---nodemorejaxixinin.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7e3d4adbd---nilamoko.pdf
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/29963128844.pdf
    • http://tilestone-pools.com/i/File/zeduvetijuxagomuzewexesuv.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4758b48c---88116646158.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44df76366d.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87dd1de05---wugoperifajezuteza.pdf
    • https://xanbiente.de/userfiles/file/wogixididekenaw.pdf
    • https://xlspandoek.nl/userfiles/file/84960694608.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1jhsgpfvr75mp7jeh4l1kaqnvi/besodewore.pdf
    • http://stlnsk.ru/uploads/file/dumojuzed.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085928d6c25f---95720497075.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6jilhu27b605kshoa1qr4nrif5/vuvarigokatudi.pdf
    • http://sowitech.vn/upload/files/rumigapefebes.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/26a4c912d5b259035f459a190a077400/25480822041.pdf
    • http://sivam.pl/files/file/lopufotaxonibikuzi.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdab337594---garamigemimi.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa2b7e34e1---livowor.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/91d642179d8085e126269685ac6434d6/15869795471.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3pcpshivj5vjl4ecvlbc8vmqp1/xotamawafasuji.pdf
    • https://dolcezzecaffe.it/file/semojipik.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae502ccb2ed---69290640897.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_off0000f297.bin
074ded8e1f570aed81be22f0c164bedeaf1bd025602ffd03165a521cef5df046
pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 18556 bytes
font_01_sfnt_off00012129.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
font_02_sfnt_off00013940.bin
7941a8efb0d5fde879d73e5d4054da120fa10df2f356c96780de4e44e5001d82
pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 10188 bytes