Malicious PDF — malware analysis report

Static analysis result for SHA-256 3248c8e8a5c597f3…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 03:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4318b8305782d43b910211560f65293f SHA-1: 9f0c829e3230d1f48906c4dddf3d79dc2c6b773c SHA-256: 3248c8e8a5c597f3c3537255322688ac13b33da07069c69795b316038fb5af08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised CMS platforms suggests an attempt to obscure the true destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4fe33e5949318501537a505b224849d5/83806423330.pdf In PDF document text
    • http://avonsteel.com/UserFiles/file/sebex.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e7963b3221916fed1c7571cabf52090b/datadavarogibogevetof.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/877bc09e5d87a70a1827da352b12bef9/65386548412.pdfIn PDF document text
    • https://congchung7.com/upload/file/memubagago.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fb1ba7ed7eafeeab133de90c93149536/tejufodezusez.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/21003229820.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5d48d0e7---41859634267.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e02575aee---roxadejaravonefizo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160731d33637c8---xokesiwotabuve.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb956caf33f---jaweb.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/darejoki.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/lnriqn52fhohm10fti6knhilvd/74312686422.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/1610351900.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0cd9166c7d0f490d61e8f89c79497c39/40588080264.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3a77f926---17082119301.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/33835761205.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/k79etlcd9jequi9o28eb0t41l8/37151714560.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/hab4p5j4iumdc82scfiurgfnu1/89737549950.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e89ca61c---38537033512.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/603ma83skg5k3ihpt8ol1rjvor/zidajewatogibuluwu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a13e3d2ca4166b922bcd6bfb89d2671d/lepajimuna.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/44950698475.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pi109b0hp75c6el6i2vjj6h4tg/15315009899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=charlie%27s+fish+%26+chipsPDF 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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 17684 bytes
SHA-256: 67439bcdf0baa28ac10a44b2a5b75e7f6232cc582af4a521343c99c01fcf6680
font_02_sfnt_off00013666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13666 10056 bytes
SHA-256: 8f29ca621872096dec5a963931ef989074da27f274a9278153e0247fab664794