Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bcc7eca53270c7…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 00:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f2ae0728af7f43723ebb8f69317983f SHA-1: ffa92d4287dac1f641904b8cbdb407ef37c6d33e SHA-256: 28bcc7eca53270c72d7765a98c355e59174e25f02b1069bd8c3b4007397fa1d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into clicking malicious links, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ah9re1bvnj8u7gfinrtul7trv4/51013267609.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb597093dff---58397268500.pdf
    • http://szentimresiklos.hu/upload/file/kukugogakexazo.pdf
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/9702169233.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9b23463b9ae822a1546aca4e9f6a1250/kidakosurabavozejokov.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb21aa73f72---dubezagojoko.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b51d46e0f---79418906276.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5da22246---75625092674.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2724ba853---1626253388.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b9dbadcc---30198397241.pdf
    • https://asiarsolutions.com/userfiles/file/gavuwivelawumafafuwofuz.pdf
    • http://hanasushipickup.com/uploads/files/jejunejunemusolomoguxal.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4a55a8f8---99496135977.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f906657b9601f0153479285867338251/78767308591.pdf
    • http://mosjob.ru/images/file/2369487454.pdf
    • https://hostmegasoft.com/calisma2/files/uploads/fabiwezimapawezagomaj.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c826930ff3---41701102517.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/cd00cb361322a50d929c42328d3dad04/92877197980.pdf
    • http://vaikevai.com/ckfinder/userfiles/files/vinezijamidawo.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609661712e557---87155084652.pdf
    • http://udemadriatic.com/userfiles/files/39569931038.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4921c33b6---50578858118.pdf
    • https://mk-sito.it/uploads/file/suliwovofepodabetidig.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb1458db8---76148133541.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2nsik206vst2qvv5bmpj738df1/bakirorejelafizerojij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=warriors+the+ultimate+guide+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e066.bin
a1d11c55029dbbe5c0632c86fd7fda21bb6c93e579bbbc8c4ec65daba4cde046
pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 10936 bytes
font_01_sfnt_off0000f989.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 16792 bytes
font_02_sfnt_off0001119b.bin
2693e286d6c4730a7b1716e0150a2b6494401bde6ded0d7671e8b0b1c900978d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 18376 bytes