Malicious PDF — malware analysis report

Static analysis result for SHA-256 0416b87cd7bd03a9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 07:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d7dde4b8e49d938fb036b7b2f65ec1d SHA-1: ce920cc20f51ee23709a3ab5c21c5ec50626417f SHA-256: 0416b87cd7bd03a977f90155628f9e6a5c25462462a5cb47f738f0464e42d179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=wondershare+player+apk PDF link annotation
    • https://robustbrakes.com/administrator/imagetemp/file/tasunev.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/69400440141.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/61812556607.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/72184948241.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/terofo.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/xujofejobutipatagojib.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/38968774128.pdfIn PDF document text
    • http://montesantangelo.it/files/files/59331796261.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202196239475829.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/38586404293.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/27066837847.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/natepegimotidipixamok.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/20895461725.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bc9t6aqict9bgl1o3vq1dang0i/91066604929.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/27228633500.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ed3fe767ae8c4fd53428c864fd208900/xifozewekutubatobawu.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/66477482395.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lenumaku.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/49219911262.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/5477115169.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/38468959291.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/ponomivigiranifu.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/69174735786.pdfIn PDF document text
    • https://mollis.rs/files/20317198435.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133899fe6c64---17898343049.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/75835103773.pdfIn PDF document text
    • 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_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 18088 bytes
SHA-256: 0773303a4538e5ac0df9662b4c8bf059177691a01473c9cc55beb2228daaa957
font_01_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 10496 bytes
SHA-256: aa5d6c8a148760abae437de931a6c6fa1cb41d8ede824d950c469c7d663142d1

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