Malicious PDF — malware analysis report

Static analysis result for SHA-256 b511790efac7d4f4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 21:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be0b9604353c92f68523a6076401f2f2 SHA-1: 0a401a10474d18a078a28b8bc2d9077bdae5f32a SHA-256: b511790efac7d4f4a2f996b74e45c033087e878020011ea27e557b119877c547
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://skiflogistics.ru/userfiles/file/94570928274.pdf In PDF document text
    • http://chelseafoodmart.com/uploads/files/wutemusisozavore.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/91153152334.pdfIn PDF document text
    • http://hotstamping.pl/files/file/53255232150.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/mexunekofemalitixokug.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/58459521655.pdfIn PDF document text
    • https://basisangka.com/contents/files/gabarixo.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/91835822600.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d2a230df87d8ae8af0e82f426ef0273f/96558996653.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/83851952539.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/09d1nbhmc69n7vin675msv6odr/45406038640.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/47218640601.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/43350903477.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210902112852.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/58242143669.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/xamewujokasorevowari.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/31738494521.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/madekepa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/44363003078.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613319bf30afd---femiwojinonigazitak.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/palipuka.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/sixosaruselujozujos.pdfIn PDF document text
    • https://novsport.com/content/File/36258891002.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109021309354806.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161328404af117---60049723243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ias+gs+paper+1+syllabus+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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 18208 bytes
SHA-256: 9df402a364373fff3d12f47c62564f09515f163451121a8d83acad0d939fd69d
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 10616 bytes
SHA-256: e5f4629abd38054fc3656a09bdf316e426901c8754e20fcf2f7b1f631e909dd0
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1