Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2d36be7c58830d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 09:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d1536ccd840a1f5b8d9a72f18727c1a SHA-1: dba0b86b99aa7f0501d79771a1a25defba55ad26 SHA-256: aa2d36be7c58830d67e84fff64ab5522bf618f01f6de6570c0ae4759200d2e6d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a lure to download a payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a0637077---37234028098.pdf In PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/jesujar.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/45752481122.pdfIn PDF document text
    • http://fteq.ru/files/file/rojudodiwudodezosoxunizil.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cqg9h66clbbp5r87dl7cnuvft6/gozujuropab.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/xoweveko.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/80235375070.pdfIn PDF document text
    • http://www.depomatrial.com/file/ratitomi.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/18261219760.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/48311805536.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905073448408520.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/revawedejajaberigos.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/82003917430.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/xefesovekekudodiranixefe.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/kokojunetamabedavuverir.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/fadilunomufitagozazugo.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/55052899053.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/zovikifuwo.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/vatatezaki.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/7b812bruetodp1btv75gqi8ll6/febifobegetubedasate.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/semisalepudi.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/zitarozafawex.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/numugodesubigamufiser.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/46915574199.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vemiriwusulupoteru.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/44343445253.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/fagivaxaveja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+game+ppsspp+tekken+7+isoPDF 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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 17612 bytes
SHA-256: 02ce5710603876e6919dac837132e14f29855574e712e224eb5b4a1052920b69
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 10864 bytes
SHA-256: 9d5169be86ae096fc161a3f5a51d624c56ee3e5e415cfc371b51ccf44e37c9ee

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