Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffc942ec994cf2e…

MALICIOUS

PDF

91.7 KB Created: 2021-09-01 03:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9b823721ede8ff55cd2c929b5c26c77 SHA-1: 5b62d089234fbe82228a3e127128ee6569bc38a7 SHA-256: 2ffc942ec994cf2ed2cdf80b2d62be1f6221df176409958e7ef38ad0e87e1142
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external links, many pointing to compromised or disposable hosting, further suggest a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • 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.
  • 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://www.heksan.com.pl/file/58517139467.pdf In PDF document text
    • https://marikakozmetika.hu/editor_up/samapogosavugagibibikape.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/42739144593.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/50596344186.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/42624919398.pdfIn PDF document text
    • http://flexicourse.cz/res/file/50183123321.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/peridunofavesevalej.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea05a6153---28759061348.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/91320774952.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/66688107316.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3bl5p4ffkdl394rf21v3ogfvc5/71849317191.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/18917185807.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/lidagujobogip.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/70409084575.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/kalajufut.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecda22f45e---62671344336.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/wevisasefokelujujilex.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/jegetevabulowogup.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e4857e53cf371f1adab4c89d5b731955/9033796613.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a15237c35c6f4b204c87ca1a0993d90b/31032658341.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/39388757964.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216181457309225.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/muwitozogewofu.pdfIn PDF document text
    • http://brukbet.com/user_images/file/vavifosiv.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9da593dc7---50957690454.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/u7n6nprn20anj3ldjsg3utns85/79686248511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+wash+leatherPDF 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_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 10440 bytes
SHA-256: 161a02d37735d6f0f654f3397b4a96bb873c1370a2e9a5d53b72f899e8d88f04
font_02_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 18072 bytes
SHA-256: 3cc1d45b74a2f65df4fe2e856e551b75c135cf0de47a7ae9ef86e2b4f22eb34c

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