Malicious PDF — malware analysis report

Static analysis result for SHA-256 6051d264c61471e9…

MALICIOUS

PDF

88.2 KB Created: 2021-07-21 03:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7131667fa1edf50bec4f96f09e89eb7 SHA-1: c3d1f469c870f35aa6bea514eda3a976c8e4c6e7 SHA-256: 6051d264c61471e91495045950ddae4e184e7de5a802d77192ea59cd589cef70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab47c230c---87632266007.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c864327f0da---55923509472.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/2bdc49d4069bf2a6207a2b045a3a37ad/17848260593.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160909e909ce16---tagotikefasexo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b175615146f---guzoged.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/salifibunidobeloxuto.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5e2e10c9---87019534596.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e754d405da71b3c8e0c8518bb374fe7d/35815362315.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d33eb31b1a93318ade8049223beeeec9/46186143357.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///nugafozavosiruneram.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160847cf3504d2---siverozusa.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/62139910757.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16095f2af46654---75116413181.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/depurafovulotofajimebusi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/62vitmmccvelde2oj2rh554lf9/74629913256.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a4c8330825cd08dab47a7c268a074584/41288751271.pdfIn PDF document text
    • http://www.emailposte.com/pictures/kerok.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/14f27df891412214b5d3fbe0f717c338/46711427248.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4m50dcveems8l6l05lconirs68/sopexowij.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/68745646109.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/18k7ka0mvd2vi3tll453os33t5/4537555213.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nc8ib4tsaph14m1n36apkj4gvg/dunodogi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tapaxegamejamamusuzosol.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/losabazugofipixekowedewal.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mc8136b9pijnfk2a5oshrgdcre/puvasokumonez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=if+a+man+loves+youPDF link annotation
    • 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_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 17300 bytes
SHA-256: 7230dc196e0f618b6ec7315dc6ebfac0ef7eb28ff21cf9a71a0280c34e38dd7d
font_01_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB0 10316 bytes
SHA-256: 4d412570fd6f9a10a8e6f849bd12877857c5b12a2ffab7a63e3c51317f3a2bdb