Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b43dae8b0da7c4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 16:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01e4465194240343f5daf8549fcbcf23 SHA-1: 9cfe38ae40cce08e3af22d86177fe334f2cc77cd SHA-256: b4b43dae8b0da7c42f82bc10f05ff0965c840aa21d9e34c879ccd1b604cd6e9f
156 Risk Score

Malware Insights

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

The PDF 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, with numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external, untrusted sites, likely for phishing or to download further malicious content.

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://garglob.ru/uplcv?utm_term=how+to+change+color+of+progress+bar+in+android PDF link annotation
    • https://latgalesamatnieki.lv/files/file/78890579631.pdfIn PDF document text
    • http://theponghop.com/upload/files/2967925708.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/juximexixuzuvajabajek.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/4642389844.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/fipiwirevopodegolosuti.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/83130a7db3a8cc29d68f4a4c39d9c37a/39689973689.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/nakuwadujo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3b48ab9d---48289084974.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109071503446734.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fipipujakujatixari.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/39060091249.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/08832a7c164fca4266db6975c7bdabb6/90226729980.pdfIn PDF document text
    • https://losungversorger.com/product/file/55733140328.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/49300139558.pdfIn PDF document text
    • https://beaszemin.com/files/19846983537.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/74674594790.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ibjdneni5bal51sha7g6r935k4/43877836194.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/92630547602.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/56786268265.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/zenige.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/pefef.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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 17224 bytes
SHA-256: 1ff723c9dcdfbabd4193ee9e2347a187cd0aa8a32c9baae4ffa97e119df1b1af
font_01_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 11116 bytes
SHA-256: 2bb0fc31eff530be8d2fdc4834f8d8f70de96f6d10713ab58f901960c0d46d45
font_02_sfnt_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1