Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb4b7a5cb36b06d…

MALICIOUS

PDF

86.4 KB Created: 2021-08-22 00:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbf3a5947b016543dac0ee6bb562a38f SHA-1: 83b1a2738b04aa9725ac28682cc791cd87dbbce8 SHA-256: 9eb4b7a5cb36b06df24edf78137db44c2d6a6eddbee5ad8185c1ea51cc70d3d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The file contains numerous links to compromised websites, suggesting it is part of a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern. No scripts were extracted, but the overall structure and URL findings point to a malicious document intended to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/5f9785a3b8476fd7285076aa9d0d65d1/17380880205.pdf In PDF document text
    • https://spvi.cn/filespath/files/20210813034902.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f45312d3c5f9f05c550fb52ec55e6803/84858713836.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7b04b24e0a0ba6f6f679143878eaab67/12162742786.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/zupekuperixagek.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/26336993263.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce927756e49---taratepujowepeje.pdfIn PDF document text
    • https://purefeeling8.com/data/file/natewapazibataladagoxosi.pdfIn PDF document text
    • http://guowangcable.com/d/files/62428905965.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaxopuv.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a87b9bd35369774ca70272925f7f822/96351305061.pdfIn PDF document text
    • http://fohow77.ru/upload/file/nozawefudagepuvumepofaki.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/zidijugafurududifa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c4dbd9f183507a491cc452426416bda2/73826698604.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/90982168793.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ee945d054614334d9138dbdaef8482ff/13814265060.pdfIn PDF document text
    • http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/bexikevika.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091812ed689c---70667900591.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ac52018---68701553540.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/698e13b84ab09944da46b1b268d609b3/fudolafavanobeve.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/lubomuxeremivapugaxeli.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/sgjj4uh7e89ji95o849jvqgdp3/22363591626.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/45877091958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nfs+most+wanted+2012+keygenPDF 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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 11020 bytes
SHA-256: 8c2b7db217b74c9c12377b2de0ad26de23f1a24a60cfc7321b36ebc7913635fa
font_01_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 24060 bytes
SHA-256: c8f478ca3364f2d7e8120d49427cf67479b1a9572a75b2a08da49c3bf0bc89f8

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