Malicious PDF — malware analysis report

Static analysis result for SHA-256 581508470f1d8562…

MALICIOUS

PDF

98.8 KB Created: 2021-09-16 23:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4839a2dafaf9de813cd6f9ba5e687fd1 SHA-1: 730a950974dde53cd37ab11bfd41328be8f2e43a SHA-256: 581508470f1d8562ac7c5b966b4b656429180742912658f4e02249cc53df8aef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The primary function appears to be redirecting users through a series of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kaisar168.com/contents/files/70112785400.pdf In PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/duforazejita.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/litikajuxalavos.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091045150_315292360.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/63160195088.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/lewujebugonojivilokug.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dad1bf100---36293229040.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/15470201947.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd86a89f6---livudefeluluxulunetup.pdfIn PDF document text
    • http://hanifeugur.com/image/files/lewoparowirolakur.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/32966867620.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce4155a07---9783711609.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/35369494653.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/naziwudajaz.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60324999059.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/supawelu.pdfIn PDF document text
    • http://tecksco.com/upload/files/6941959085.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/setoduzamowubuxoviradiko.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/41212818617.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/dinefalisa.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/dafaludox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=latin+words+starting+with+fPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 19384 bytes
SHA-256: eb9efe89cd546c45ed8af2f593d58cd72fb28f9ca771cef371ac84866610b049
font_01_sfnt_off000136e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E3 16368 bytes
SHA-256: e49c18fcc622de4025f34f56a7d74ae14135744a9b5b1c1346f5d0e0d012f54e
font_02_sfnt_off00014d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16580 10496 bytes
SHA-256: 490d92858def79e8026d95c4e37ae0ba444cfe9fa226703ccd274be405d56c59

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