Malicious PDF — malware analysis report

Static analysis result for SHA-256 5052c243654ef5b2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 09:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0507c0d2579a00b5419d2d04db0ec255 SHA-1: 25077f76f1df25c6a185b8a655068dfa4d641235 SHA-256: 5052c243654ef5b212649d5ad2672c5d3927b6c0e0b48c95d2c9a3351514115e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, with one URL specifically mentioning a game download, suggesting a phishing or malware distribution lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the malicious intent through multiple redirects and compromised sites. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thehouseproduction.net/file/kuxorebe.pdf In PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/54926885186.pdfIn PDF document text
    • https://insp.biz/img/file/rakal.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hf0l6i78mlf5sjjmq5cqvo3pu7/ruverowoleloruxufu.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/1482095702.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/17535932238.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/korefenaxiwaruv.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/sisetaroxoxi.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d8ca53032---99323697010.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907002808.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/20037252972.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/bapelubegofakufasilup.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/26d735e49dd7b538652f445f5067caf9/80792182541.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/11891298642.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/tinabelanowurawirazudara.pdfIn PDF document text
    • http://saint-party.com/media/file/biviwiziw.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gawomimenekoj.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/wanopazadudopavozeza.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/4740981253.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdac17d4e0---janalagukukasig.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/7786763887.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/wajojikogazutufuriler.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/61202782038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+harvest+moon+friends+of+mineral+town+apkPDF 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_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 11008 bytes
SHA-256: 9e6fff96ffdcaac21427249edabaa9a839920c6b448e7579c40285c2d1e8bbf9
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 20188 bytes
SHA-256: 021db41ab2b925c71a4f13a279f3b1f1c6da659c0fa1f8616ae4e2263547b231