Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5715f200f3fac07…

MALICIOUS

PDF

91.4 KB Created: 2021-07-31 00:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5faffd08e876a8c5aba5fb9e1aa8205b SHA-1: 9b79d1ddf99635a7f670109d381eebac66637792 SHA-256: b5715f200f3fac074709366ecea20ced81ffb3995f63074284203f27cc69369f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://pistant.ru/uplcv?utm_term=naruto+shippuden+theme+song+mp3+free+download PDF link annotation
    • http://pattarasawat.com/ckfinder/userfiles/files/waxozemulojewezarej.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/rokesenoluxed.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/10312b782633b8dc8dd6a5602298f0b0/kelufo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q0gb3i74n08qhkjsa2sj92sab7/5638687506.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kbmo9upummt7teae1avbjfptb5/riwovefajemazanuvokuwax.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/widedilaponiveko.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee283558a---juvak.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6705b7c0b---jatepelep.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7a42944b9f572315b1f621c8ae6fab5f/39158346716.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/fesixexogizuzefomulavom.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/787uqpdhvb95tj5ekbhuqjo8mq/11905172211.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6baabafc2---nemotuji.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4348fb46989d2b2ad111846c3b15490a/gabigunekax.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/luxetasunez.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/xemajupaverikokor.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7c006dee5646bc2b4fded7f89ca84bd4/zesamigoxo.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/degogilawokusuwonepapej.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea894340e4---10420484297.pdfIn PDF document text
    • http://aimic.com/userfiles/file/22866786970.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607222c9bca61---31015743094.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/93706364462.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84fbb65784---61425375138.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/93370770486.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/1035589928.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f148.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF148 22772 bytes
SHA-256: 40543cfed67f3efe9c7b078c0372e824f4eb9e9265d0605a949af6d210e1eb4a
font_00_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 16704 bytes
SHA-256: efd7c8f545c09449f6b570184f72f50e6569024d9f0f0e777e9c7b8bb654b180
font_03_sfnt_off000144eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EB 11280 bytes
SHA-256: afa6cfd96a9c2b9afe38c424341f63449d6caa8644509af01df46a8fcac2f409

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