Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a2ed7a123b412d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 03:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5037f36e2231448ca60b80aa507a42c1 SHA-1: 558817193c7c7eb7e8a879c6a9edf13e8d4e6580 SHA-256: 40a2ed7a123b412d892149cb9608c27d94a0a400a582ddd440f179fa64c35197
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ngusacdon.com/upload/files/35886333697.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b70b494c0---puxaxopu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/fenefomolodufudivofu.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/93045151292.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/sobuvaletovixovepape.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/puxezed.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609975b029e18---87051493066.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/35412976134.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/71485735727.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/waribituvunexif.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833af2d086d---fakojatefabotil.pdfIn PDF document text
    • http://jinyezi.cn/upload/bikolewaperukokireko.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/7478525941.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/94370198636.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e208720bc788616203437d775f6dc493/dasur.pdfIn PDF document text
    • http://anpo.vn/upload/files/2321811293.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/66824611122.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e06049516---94910455786.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54cb9c0b6b---sedif.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/fowera.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/linutizovigimikosivej.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/53676d827e191edadc43df03831bc060/12005735184.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/35553340596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=alien+covenant+streaming+freePDF 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_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10724 bytes
SHA-256: b7cb5cf965af2fbb0f6722c3731a33f0dfee7ec012ba21d9b0a9bf756d23ca0b
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 17360 bytes
SHA-256: bf0f2e1e6ab8f9160ff53e03d295f1f5f9270ba25ce0bb8e839c8d76c163e6ae
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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