Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52ce7453dc4388d…

MALICIOUS

PDF

84.6 KB Created: 2021-07-17 07:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90eb0f5e6a68ffc93ff3064eeb36d2f6 SHA-1: 4368cb24e9ecfe19c6696160f89fd3d062f71305 SHA-256: d52ce7453dc4388d5e9092b142629b0eb1608ecca0268bc72d1f7c094dfa678c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on various websites. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The embedded JavaScript likely facilitates the redirection or download of these linked files, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://termocity.by/pics/files/wosogezogumulatevo.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/waxoj.pdfIn PDF document text
    • http://yuha.be/_files/file/tejaxawez.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/10011241338.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/58382710543.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/37ae0701a0774bf62e70db98fc955bd8/85919291535.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/57691290748.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/retuvexudoratabowim.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/hse5f2bctcgvuibeadm2nk2v53/19166025071.pdfIn PDF document text
    • https://bloomeng.com/uploads/72017892183.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/kenunekovatefowobil.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fe7461a3dfd893d08f02e7ae8758259b/vokaban.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160757f28ba2cc---pojovopov.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • http://fullx.net/files/23430447683.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/67584870066.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607935f37c23c---1217290573.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/97114752583.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/bl6ts4djln33hl0s7a5g3mqmt7/xexanaziroziv.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/neriranixikodazexoxovo.pdfIn PDF document text
    • https://inncredel.com/uploads/dojaguleximo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0d1349e95418c14a7361adc3161ab396/73070467743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=everlast+what+it%27s+likePDF 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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 10240 bytes
SHA-256: 679b95b54600222d420a90c26e0e41b0a7f5cc45329e851edad760d5867a3ffe
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 16604 bytes
SHA-256: 43e8d8b06332e436c5b99bce2c56f2a0dc776f0eca2515fe641cccd01d695847
font_02_sfnt_off00012d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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