Malicious PDF — malware analysis report

Static analysis result for SHA-256 016ec00bfac8b4f0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 10:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b687c0359aa850d3eba6fcea4e18ba50 SHA-1: 5f1a3355048203fbfd478e759b39db96debfa02b SHA-256: 016ec00bfac8b4f0d72ce53af6bf17dc9b39b5e0ad23b7c112de1104646c98f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators confirms the document's purpose is to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=as+i+synonym PDF link annotation
    • http://premiumcsp.com/uploads/files/buvetinazunozebiruvemefe.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/kunafoj.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18459c8a2---vanenotikolan.pdfIn PDF document text
    • https://olterus.info/contents/files/47886945350.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/45346759409.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/takisexir.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/22441569999.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/90283151725.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/xedifixalimofid.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/kunudomoju.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/bixejukodazozabukisebovog.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/tiranorokokikireda.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/54447685556.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c75a072fe6cbcf21ae03027515fe68c9/ripafizajadugobubateri.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/arsi5rt5jqbvj318gglvo1dsr5/jezapibekebobusixofiv.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210912170724.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/95438521956.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/verowabafazimonoken.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/40564596398.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/zuzobujugizesinojedukija.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/pimonanabusur.pdfIn PDF document text
    • https://vpmemorial.net/images/file/debogijegew.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_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 9824 bytes
SHA-256: 36b0231252da1e331da093b5b0a61d3ba78fea0f3afe0eebcb21abe838431c43
font_01_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 17444 bytes
SHA-256: 2cdd9ff3ade98eabe8cf866f312a0371d3d5c90b423b8139ca7b84b465862127
font_02_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1