Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9caaee10cfec20…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 10:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45e21c56fb7231112e8e0c0dc95fa7d7 SHA-1: 3eb5dd7daa1dfb4bfe6b28475889b3ddb5b5a1c5 SHA-256: 1f9caaee10cfec20dfecd9754edbd825d31bbc0a20ae8bf12804a1f39a9453df
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://raiporjai.com/piceditor/file/43434175313.pdf In PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/dasalokikakelafelegunisox.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/lifewibopamidarisipujeza.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1816dc91b2---79306536851.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9922b954c---siximeke.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/24/file/20210624_051733_123.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5c4e5853---51554844706.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/jaguwapujobijem.pdfIn PDF document text
    • http://lamay.de/userfiles/file/mawikomes.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210725_716E7F470801EB35.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b36f2aad388f235c346dcb32ea754b7b/vexolekirigodifinuvo.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/sizibaxirixa.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/ramewupekogijepumot.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/4oa28vphlp4vdmsivag4630jk3/bujovaburozoder.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/13133725739.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/dogaxenopi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/9653690389.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b363d8c06---zomivuzeroripi.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/boranatutidagaxola.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/13663061321.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f3324f48---bezujadoxa.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/suwomu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/17587938910.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/10f47ee4118527308975cc58354a5d03/doxugutejalifakavelej.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5llmvu5h2t0av3lavk3nemcui7/88472908731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=12th+public+answer+key+2019+pdf+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_off0000bea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 11612 bytes
SHA-256: 6cfa7aef08d56911392fbff8734c9441ab4c353007cdd1d44955ee88e9db1f58
font_02_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 19140 bytes
SHA-256: ed75e2eed7f070e70a722aa795cb7b2bae5d4e4ce46a3d07d93544765ef590ba

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