Malicious PDF — malware analysis report

Static analysis result for SHA-256 064a3bf1951e50fe…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 22:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e8f81f9c398d5c2568576e38ec4ac3e SHA-1: 5f4a895da6ee94ec69388a3ecadb021c9809404f SHA-256: 064a3bf1951e50fe9e75b2611acba4ab77f9d051c2144d76c5d477435963ad09
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive URL redirection suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=table+saw+miter+sled+plans+pdf PDF link annotation
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/98414928370.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/gevuwutiwaduj.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/gisupuwasubipafikuba.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074573ce2f53---fezixug.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/5nvmvkom3b5p82t7811m2hrquk/2833023070.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/54962653994.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/deturiradivogagufapa.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/23420737430.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/siligepesutizesomoso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d86a1f36---84536596420.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a295f892---23203802905.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/76a32abe19162d06d5be83d48925c4fe/zunupisibovif.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e0580f315af0ac7acdd14caad1d5fc73/wusafavadovenogukubosenef.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/krodu7b0vo4f6t2ov7542at9aq/93648442498.pdfIn PDF document text
    • http://agro-partner.com/Image/files/xuxolif.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/dapos.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/20094399860.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/91434542940.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb1309394---21195325076.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/91698419675.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 17452 bytes
SHA-256: d70330a028e357a4e78531bc9d37469211d91dd97d8054b3ab0e2f97dff9f28b
font_01_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 10728 bytes
SHA-256: adcfe7f99ff32362e18bb32e98634e1dca399ecdded0315b13c10eb323100754
font_02_sfnt_off00013618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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