Malicious PDF — malware analysis report

Static analysis result for SHA-256 39400738ae0fd93f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 06:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08eedf8b7e43f151b53bb4bf2e40ba83 SHA-1: bc23676bf22e81a5762f5d2cd431f41022a802dd SHA-256: 39400738ae0fd93fc3fcfc24f009256cff65ad841ce85129f3ae668e939b80ac
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the heuristics and URL analysis clearly point to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bhsbeacon.com/FCKeditor/file/35267713109.pdf In PDF document text
    • http://4els.ru/uploads/images/files/vurijovezizopobimi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc3787022a1daba5c82415f4589e800b/wosivobusoratupadolebagi.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/74430329315.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630730766.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/39939448922.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/74078121200.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/rivozibuvanevebepujomu.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/67699493127.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/begipafenuvedekokemoli.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/20876965626.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/34gv1ba7bp32jhcl6opt0asks9/89077800753.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///19553448738.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/jumenunodiv.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/vufepufiruzo.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/werexusuro.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/95782348060.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/69940062446.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/jagiwajonalitoxanokanuk.pdfIn PDF document text
    • https://majubesar.com/contents/files/78777150411.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a38ee87c---logemepiramukomuxek.pdfIn PDF document text
    • http://runhouchem.com/upload/files/zawiv.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/zomaretesisibuwevubow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+get+omegle+on+android+phonePDF 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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 17620 bytes
SHA-256: 387faeb28ae33a86768015179f07f067836a98850fabe29bf1334c79c69ce01e
font_02_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 10916 bytes
SHA-256: 72dd84adc998f31c6ffc009162d2e77382d58e8ac869ad75fc195ab08ff47943