Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79441553a37c2ce…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 06:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f5b140b82c74ad070a07e2dc312c9a7 SHA-1: 83b3f6c440d27c2d6c5d6eedbc99c29fbf1f9d86 SHA-256: d79441553a37c2ce2c077fdf809876c215213ee50ec3cebdffa536b249bcfe18
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings and numerous suspicious URLs are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae3e46258---37283072693.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/74eap94mpl2imodh10i8au3a87/73301474681.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623855164.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/dijume.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249558bd40---lutuxofudikaj.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/firuveroxisot.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/mubemasasukaz.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612125f316f88---vadekaluxuloposupubeloju.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/retekakenijagoxoladub.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcbd77557---rupolunexejesu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8dee46e77---xodewud.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/latemudomudarakevur.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/49657043324.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfffde44f5---papudoterixerodomonubu.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/74325162842.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d33dbfdd2.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/83941310489.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/683416768.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a8347df4b3af84d14da00aa3c1075882/84299087808.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/77605624265.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f76e407e6---xikasonunupimexovapi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/dd38ff7d37ca768a43ea14db79198245/99815752665.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/q4e06b7t45heffiab2gd7c501k/rovifarebilewevaxisok.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f87a982e748---baviwejutasozavetofuviwuz.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a86819f0188---24805297401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ncert+exemplar+class+10+social+science+pdf+free+downloadPDF 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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 11120 bytes
SHA-256: 6c77b892d7815771fd4fb2c58185081bf12e54515c2c4aad750ff1d14d162a18
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 17648 bytes
SHA-256: ec2906669f183eaacbfb3317814120ba919b8eba2e83b5d2c34936a972402744
font_02_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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