Malicious PDF — malware analysis report

Static analysis result for SHA-256 1574bd055c80d321…

MALICIOUS

PDF

94.3 KB Created: 2021-07-23 22:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0438c958e9097d932594fb3455cc48df SHA-1: 6b10587e8210f2fd36ee8cc1d541c1c23524eac4 SHA-256: 1574bd055c80d321e76282f1a8da58d9ede10d345ac3df49a8b652add7cd61cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. This suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://stadiumhighschoolclassof1965.com/clients/0/00/0080f9a3d0f10e930bcfc39f0a940e94/File/vexizilekiwawasilurelon.pdf
    • http://www.alfapilates.pl/upload/file/40447691739.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jb33sakvfpnk38ts4cl1047mo7/74005182049.pdf
    • http://fujavietnam.com/images/Download/71469616301.pdf
    • http://botosani.ro/img/uploads/file/vulepotamabalakutet.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f531be6ab043d359aa9e3833748e83fa/78011219031.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1tar9ht4np996msb7har99b2k7/lapibebatita.pdf
    • http://dongshengcable.com/images/upload/File/60580640019.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1a3682ae---87824983650.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9976a09c---28436679401.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4dd4e8753---jorutalexulokulodoxivo.pdf
    • http://cablexconsulting.com/Upload/file/67727060847.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/30b073432e5658569b5ac41fa579f976/3830035766.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f61a65f7e62f2795743390689f5d5866/tifix.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/92f911d1e8db71f9e143de79ed96b106/javuduwofilifupupotira.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/2dc684a918890492d46adc9923196a55/83356500671.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jisarigabofewukugedapila.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7472c94352---5395010968.pdf
    • http://accessiblevehicleservices.com/userfiles/file/55903284218.pdf
    • http://coffee33.ru/archive/file/28293081879.pdf
    • https://aneri12.cz/res/file/wedozixutir.pdf
    • http://worldnaturalfood.com/image/upload/File/tuzonefutotus.pdf
    • https://bd-sokolovska.eu/userfiles/file/roropivoba.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e43dd0207---wutatabasojome.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=baixar+cd+ra%C3%A7a+negra+25+anos
    • 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_off0001054c.bin
e30b6515bb0f564abfc64a8833004ec22772658c90f09a30967e93d838ea6dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 20792 bytes
font_01_sfnt_off0001375d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 16792 bytes
font_02_sfnt_off00014f74.bin
8ef7d7e4bcdf9ed315a21ddb6bbf5d65e0bd350172a51ca3287a1758a07d3195
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F74 11008 bytes