Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf9c988e1725632…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 04:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 679fed121cce3f71f16206d19709aeaf SHA-1: 8d11075aac06363f527bd96e2ba6242ba6e24061 SHA-256: dbf9c988e17256322c3ec3cb614b20f9341bb6dc70eaec087d549be47dd3ec49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614256ce9fc09---dofeveropawuze.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7dc38e4226a7ee9b671bf9014c0b6844/fitutopoj.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ab820c4---femupugebidozedituvilusiz.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/susijofekonusaxunepax.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///jojenedujuvixu.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/19999184328.pdfIn PDF document text
    • http://benly-carson.com/product/files/jilopa.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/livazarexogotuta.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/pesiperajoreruguda.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/36552471506.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wisodujusiledeti.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6pkul1ht25konaqd66mgmet8p6/tuwigigovot.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/75256447202.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/517836993.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/4541544689.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/94735878761.pdfIn PDF document text
    • http://vaynhe.com/upload/files/kigavidewegalelipugutad.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/19794913394.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/35277284819.pdfIn PDF document text
    • http://ccshecea.org/upload/files/72561615382.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5822426d5d3e69a2fb3bf56a877b6d66/wirirafofuzafufeledor.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0903431001630795055.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/warowasug.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/wefomabevivet.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/boliforijig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=plan+3d+interior+design+home+planPDF 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_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 11012 bytes
SHA-256: 2ac394b9d89affe1e87e1c0c1923c2d689ba1446c53ac8b8eb35f985cc5d05a1
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 16908 bytes
SHA-256: 7bc6bc4fb4435b50dca067b589f858b9832427a41139624ffb244d63d58243be
font_02_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1