Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d015cda5d903bb4…

MALICIOUS

PDF

123.7 KB Created: 2021-08-15 23:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6733a6393119586a7f8d745ee4d9af8 SHA-1: fe38a0686f33c8cecd95c5028200f7e62a216131 SHA-256: 7d015cda5d903bb4550256e1ea44b2cbf9a60096c0591a7b15715c2759ad19f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely to distribute malware or facilitate phishing. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading malicious files or visiting phishing sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=grand+theft+auto+vice+city+stories+download+for+pc+windows+10 PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c82a23d729dc11ee0931566c2c67cf89/xutagojarada.pdfIn PDF document text
    • http://temple.mo/userfiles/file/22861080786.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/bde571d4d82d258c21a3e24d45fea70b/suwosubetivovofe.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/23397494081.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sivatojudufaxix.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/tanikanonu.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/nokiletite.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210520021505.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/lufowuxukixarerimijiwifej.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/99837369972.pdfIn PDF document text
    • https://fratellifurloni.it/file/guvexig.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d861c2afb---vajofofojofup.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce86dda89d---89977751341.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/29485060089.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/lirutafilikovo.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/8252445894.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/14849591051.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16110ca8f96d4a---fudonixix.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/85259821684.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/6699160364.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/35794a73e608b9def94ffc77a5de8f19/wilevujesawiwalibof.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc40f505---59642580632.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/24455388934.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81b8f84b47b71519f1a8128cfdd26fe0/rabazifepuse.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160720b50b5648---xofuvapabi.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_off00017fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FCC 11296 bytes
SHA-256: 988a6cb3b965d899fca55b46e3445011103ba03006e822d66c873517a2897c88
font_01_sfnt_off00019a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A62 17572 bytes
SHA-256: c17b731a0d7edef0799aa90b2672f8b14c7e15fa96695f71bf7e56d7622e5638
font_02_sfnt_off0001c876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1