Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c31945b51a6bfc9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 20:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 14c2333b25cc7cc35f640be343191a6c SHA-1: ccc144d648c2accf2ec663433130046b2afe6aa4 SHA-256: 6c31945b51a6bfc903fa0594e626f0e08092e14212fb54c196f96d035e2f669d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS upload directories. The primary lure appears to be a fake search result for 'hssc clerk result 2019 haryana pdf', aiming to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a007a64b786f25e5a154bf9a59dbb5d8/58248814051.pdf In PDF document text
    • http://myexamadvisor.com/fck_uploads/files/43989029147.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0ts1d4kv16hdf90obk1ncl4u91/nubudolo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/51270493216.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaa4a1543---89675329813.pdfIn PDF document text
    • http://standardamulet.com/files/files/8917878546.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/94610245091.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/xodisejoxasujugaduta.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/71564224652.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/69785659722.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cg7nd0320pi8cgs0sjnnub98d1/7821099074.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/pomesepetopejoguf.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9a1f139bf7d1708d53e3bcec29b289aa/nuvewepateremozevofemu.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/sikorobipuxuniguxom.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32efce2997---25195162917.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb917397da---94192322899.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/61361008678.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/25998529164.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30445e5cc---23384968402.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/41770601919.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kemuv.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/wuguzi.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/faripedez.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e2abb7d729ef50e80574639f6e5ed534/mevezozilazofotozuj.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/01e22fc00d880697a46354554c0bf0da/pibunajagosujijutuwepalew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hssc+clerk+result+2019+haryana+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75D 18692 bytes
SHA-256: 6902088e411612785f6b8781a79c12931af547c7881139f7b414aaf2c247f728
font_01_sfnt_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_02_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 11264 bytes
SHA-256: 79708757a1b9f22050f1fd852651ae58d2f24a19966803b952daf09daecbd7a2
font_04_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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