Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb9098ae3866270…

MALICIOUS

PDF

97.2 KB Created: 2021-07-26 01:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de13761747be782d3ef083e7774c3541 SHA-1: 0e96bd7e8135ac66cf5be5b4a8888133c06461dd SHA-256: 1bb9098ae3866270dd946af366bb8dff3e198ef5b406ca0050f1ebbee05b7009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6b8a6da5---mafew.pdf In PDF document text
    • http://klinikoral.com/img/userfiles/files/gaxavulofumo.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/xijifirixa.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/bekuzizenemakerojabem.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/086915833984d23f981e7d73a321dccf/99111300599.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/97803897105.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ud12dc3r8o7ios9htip8cln5us/dozosebubutotezusimo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d395287d540f11f34eb688a0c67cb9fd/1148130604.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/r63lte3iu400hf4t1m78kobks6/12287693731.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/u625t71aset8hueii2lf2rg81d/66321319555.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/78653075236.pdfIn PDF document text
    • https://greenvision.vn/hinhanh_fckeditor/file/tunitezofugadebu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608572dcd7e29---rolukalarol.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810030e303c---16804667031.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ccf29011---8894890449.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/30532047966.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91fc78c2e---91469074717.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af961e0939f---mojufofuvirita.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/to2ep3oi02frdggbm6ccefm3sk/buserumizuwuwuw.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf967a0f80c---55292904518.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749a095c8d1---97528764554.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/75082405621.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/tajijekegepakipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mantoux+test+reading+interpretationPDF 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_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 10716 bytes
SHA-256: a262d3ae3d082cf00af1317da6e32fbd6ad732d43cf0918edcf336326d7e60c4
font_01_sfnt_off00012d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 18316 bytes
SHA-256: 0233b32fd49ce6379a58d0a24ae475a48b42b5a71b7ec5da48e79e41a6ec67da
font_02_sfnt_off00015ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1