Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e7f9834c804dbc…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 22:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53c9ebf31be88ebeb05a9e2645c9b2fd SHA-1: 3bdfa7cc24e504a8b85eecd263ea663c99e16a80 SHA-256: 05e7f9834c804dbccf8683f27718c85fd2e1caaa6b46a98a9723ce89d2a5fcc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://oniceh.ru/uplcv?utm_term=facebook+com+android+download PDF link annotation
    • http://form4concrete.ru/pics/cont/file/wamedesu.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/56267901982.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/05335bae9c9b8292c322d6ca7b482fc1/81682050678.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/15258024503.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/3062583728.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/98732890547.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/dotuxizujusizedevekud.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/gomazikexepi.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/64331190798.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/xegodipoz.pdfIn PDF document text
    • http://mq-water.net/upload/48082785693.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a82fab9f9---vakuzu.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/jamenuniduwa.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/mofodeguzetapigezazajaje.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/27401829050.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/tariberepewiwalaxiv.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/6156256094.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/jufikakorep.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/96170169526.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/takelewakedurimuzogili.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219132051444260.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcbd76dc15---dojubomumofux.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/72726623803.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_off0000d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 10560 bytes
SHA-256: b68a6013011a560bde51f4b009cfccab0dc7e10c1d898e9c102167f0ab2a05f3
font_02_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 17104 bytes
SHA-256: 04f87fc3c3710693dc3e6d9b84b64820fcae0e26e398e8c373f72e1798f83258

Open this report in the interactive analyzer, or submit your own file for analysis.