Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4ce9adc0635c65…

MALICIOUS

PDF

91.1 KB Created: 2021-10-06 00:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f498f56eccb12aeb205dc582be6eb373 SHA-1: 6343286945e85a6b3c7cffb1d93266c902f759b7 SHA-256: 1d4ce9adc0635c65be5c1c10017c620a997bc9f0c8db90363996d4cc6ae42eff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://sibinetweek.ru/userfiles/file/99785017522.pdf In PDF document text
    • http://hepiran.com/cache/fck_files/file/nupezujejowazixoba.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/17575352120.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20211006054220.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/50932818058.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/kiwujejamowuwebukinem.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/sofinomamusepunezelava.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/digumewazi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/v60fuirgepnfcd8vedhnm1k5p1/66030813089.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/56106816478.pdfIn PDF document text
    • http://fivelscope.net/fckimages/noneketojegonubapeno.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/13753700676.pdfIn PDF document text
    • http://aotmoo.com/uploadfile/files/20211003_230832.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/rumusi.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-15/20210915191651118397.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143482c1f3de---92401762962.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/1316441831.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/576f4fbf9737d7ab8953671e465361f9/fiwimilopunajabuwapo.pdfIn PDF document text
    • http://dr-temt.ru/images/file/zitatep.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/89990467918.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/juden.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202110051644554503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=another+word+for+having+no+moneyPDF 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_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 19516 bytes
SHA-256: fab87e77d444da1abf6a5dca9a101cc87eed15d7e11b924132d880df09d90ccb
font_01_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 10836 bytes
SHA-256: 18f85da176cacf34aed1d6590a292df3bade4fca93555f651ba939fb235f6a16
font_02_sfnt_off000146e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1