Malicious PDF — malware analysis report

Static analysis result for SHA-256 749ec85c3dfc2428…

MALICIOUS

PDF

90.4 KB Created: 2021-08-12 21:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f39badd2b199a2bf7ec012b88f976c5f SHA-1: 1cf06a9442d3caf039f332e6b65b43bb16a4408c SHA-256: 749ec85c3dfc242856a6bbb3e0dfde67a246796250621b32874c00e3c4336069
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=what+is+a+nice+word+that+starts+with+a PDF link annotation
    • http://amuseonline.com/absite/userfiles/file/39565970962.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d9024b46---54701606743.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fr1g2u362otteio2j282v6teg1/69266795990.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a00b2f51c---5251031390.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec35930ab---penebixubodinomagetebafif.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/bipikipokekixebetur.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/supabe.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/lawit.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/rorexurokiwoxanonena.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/1651991747.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099c017ca28d---renogarigotezufuwofe.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fidaruvamofixe.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/xosopikemoxozovilozube.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/suvabixenoxunalaviwoto.pdfIn PDF document text
    • http://claphamtaxi.com/survey/userfiles/files/zalakejewopuliwubenelefij.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161123c96ba03a---46037693848.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114794dbab50---4715988705.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2efc12c8d---69251855045.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/861f7d8c2d64fdd71e36e796bd3f05b9/zazurovidowajekijikir.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797dd7d695b---wewom.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c532841cc84---raraxati.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/kavopepasop.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d70950911---66069762536.pdfIn PDF document text
    • http://sro52.ru/uploads/files/26694210236.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 17392 bytes
SHA-256: 676b44c73d511ec83f6153b2fc86429ef5ba6e34f81cec80ab76ca6b19d327fd
font_01_sfnt_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 10500 bytes
SHA-256: 889f665cf3b0b7d28a96e099a23c061e02ecac79874a8578c188a086819dbb0a
font_02_sfnt_off000142ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1