Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98d7d673f781cb7…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 15:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d8340e3f2fbdaee4ef37f9fc6d37d0e SHA-1: 523282dea5cf4669805cb5925c8c17ed9e93da33 SHA-256: a98d7d673f781cb7eee8b49e39351ba442ada5b46fc369691baf2a13f4e17d71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with multiple URLs pointing to compromised WordPress sites. These links are likely intended to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/62c987f1d861202a2a35ffbb631998a7/69351399301.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/409e60b67b8836166d9b977fec3fdf78/28333618459.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e5ce7fe1---96595777854.pdf
    • http://parkhigh65.com/clients/4970/File/lufizepamimexuvi.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c28c52e75b7---dijibo.pdf
    • http://pcwenhua.com/uploadimg/file/1623589600512877117.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a0rc5up4mrvuai9crub07h95q4/kupejixesideromipugeja.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/93715683614.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f4e1b114d---wiruzawumujepanezitonu.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b194143534---puturejowuvajufetawili.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mtbgobl540heoc5n2va331r388/topexotuxusuvojowasabozi.pdf
    • https://ringid.vn/ckfinder/userfiles/files/lujigepekuwunuwegiwe.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fc810ee679f546412b640af440ed238b/vanejoz.pdf
    • https://camping-du-lac-dijon.com/fichiers/nupagubom.pdf
    • http://adamlegal.com/userfiles/file/jutavene.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/tadawesebesojopodufane.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/de8o3scklmsmga5fmjnah75h6p/bupemogunogir.pdf
    • http://moreit.ch/productinfo/file/vuzojumabik.pdf
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/52375995871.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040622f70b---77455524688.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/38672554777.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7b0e2ea67---jetazoxunabulasut.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3104860b01ab9c0a92707f4f674d17d7/63704124739.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9ue2bii1tcsm02aes0sq9eeeha/87470100275.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wileyplus+physics+homework+answers
    • http://www.physics.smu.edu/rguarino/1308su2016/
    • 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_off0000ef33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16792 bytes
font_01_sfnt_off00010745.bin
dfd08a4b3f604ab52519585a2d6f5c087d827b2a597df038e4694bf7d4c23d05
pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 17160 bytes
font_02_sfnt_off000133a5.bin
b4aa73a6f0c5f53dabe5622d04872fb3664df992f38675771e4fac3fae5aba9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A5 10924 bytes