Malicious PDF — malware analysis report

Static analysis result for SHA-256 644936d085db0b5d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 11:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db17af0fea54eeb1010d0ea69207af67 SHA-1: 1dbe92da5f6210a4b8bfd840e337771f377b3fdd SHA-256: 644936d085db0b5d814a867cf326ad8850d582e445eb3eae67d1da1d2a9a3b18
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting services, indicating an attempt to deliver a second-stage payload. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The primary attack vector appears to be exploiting user trust in PDF documents to redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://memorybg.net/app/templates/js/ckfinder/userfiles/files/80922933893.pdf In PDF document text
    • http://baovekhucongnghiep.com/upload/files/60883602076.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/bebanokuvonafujawunul.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f72624d5a---fokuranosam.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/papogebarug.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/37835135211.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/92338670366.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/57311435197.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/13505706439.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/3890149859.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/16676201581.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/91572038483.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210911_7D075DA4D9877569.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pokomadunefedu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dl6iug1vi5bb90c802s4q3q2p7/mabuletebaseditexujugoj.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/68183955493.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161384837d8c72---90885704144.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/laxopewo.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/19557326670.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/2202989656.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/fajorobod.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/lumesawunajov.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/81016036764.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/rebinedapalavuwediw.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/42015680967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+android+system+worksPDF 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_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 10648 bytes
SHA-256: 666eccb6cdaa448e190071699f9977826a105cb3170607cfbfb3f45beab4796c
font_02_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 16432 bytes
SHA-256: 5969c6b8bd3de9b0c1f2e793bf2b21865d4586001c9b5ea6aed24bf110c54ca3

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