Malicious PDF — malware analysis report

Static analysis result for SHA-256 829465dd6d60a88f…

MALICIOUS

PDF

87.9 KB Created: 2021-07-26 12:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29bcfdb1c13c179e74cc2c721a0a9a50 SHA-1: 5aa9c7fe5dabbb391e15a7d321113868e37d1cae SHA-256: 829465dd6d60a88f9fbd03114803200dddae5270cdb734014ab726e87573d045
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://2sisaccount.com/userfiles/files/wiritimifirapapekagop.pdf In PDF document text
    • https://hondamienbac.vn/userfiles/file/pogitomotajidit.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9054aac6e---zotudu.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/pibig.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/657674001.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a454427a2aa---24419040097.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/68164998292.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/retepamamedubodiva.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/demolopa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ibrc5reco4er7u7mobve0puemv/74208461385.pdfIn PDF document text
    • https://medtek.vn/storage/file/53562176825.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/tafuredogamu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/36245259194.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4814650806---7773276997.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080add40bb1d---53913485379.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/sjf48f0ppiiqgkirvotlaqhdkb/tosaputopujavazizujejabin.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/a09k1iunb5ln6r6uiop9u3a8b9/ruzedugab.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/8149903133.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/flpfidgo1560hitnt81d9ne8f0/34743530122.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/momesebiwedazonivig.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/denawupiji.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/dusiwozozejotipulotosowow.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/95a04d9485d89771a7ece8c2655c003c/raboxizexoxebosokovo.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/xuruguxejajerekedudapita.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1e2039a22364b77509fd4871b024d0/sowenirimewi.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/lc9famdkdhgh00trio5o6077u8/80672183315.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c0450450cd080a6a49b6ae6563cba12f/bunolodaduxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sociedad+civil+de+responsabilidad+limitada+per%C3%BA+pdfPDF 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_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 17996 bytes
SHA-256: 6a2e73100a0d0b77bd1e913f0eb0c0f26c44338c2440ed972befae9f4ba65734
font_01_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 11180 bytes
SHA-256: 9034ba0c34a999b21cf7ee6cc52d4f7ccc003d20bb0b7a366dc3a7e4ed587397
font_02_sfnt_off000136dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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