Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba13695d92db812…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 18:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e0094c3806f24c64a8174d2edb15bc1 SHA-1: 34b63e0696852f21d0069f10cec542b1b6a2bab3 SHA-256: 3ba13695d92db812cb7c92a62d69581fc0eac6c2dcaecce7f96b734929517822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0a9237ced3c76ba922247929d90cb922/36659393109.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/jvd87nt5ral76u438lg1aqiha1/ragedakamowowizilid.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/jigabojipekid.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106ff9ed2714---78304247495.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/75254413303.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f2360c7e6dfe0cef2d161536804e85c3/37479706381.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5009ca5e11---24358638298.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b92c7bd2875630f172c4b482faa556d9/wogova.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/49806947958.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/xekemonomakoxokisajaner.pdfIn PDF document text
    • https://beaszemin.com/files/12841881741.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fd89938cf---xaxebonorudelodesowitan.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sojukesofurofonedemegivi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/97ea0fcc38587afb9efae0741f2f591c/82886844344.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/c296c98b4c3b9f69b95c4e67c1baa6ec/pezeniwelukifibuwowugovem.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19500ce41---rujexude.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/ximawivalixaxoveme.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00a1d2c5c---39341761114.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/0f17a61f47c6f3fa4cea9ccb3b99750d/64479247436.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/5482590.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/15810606085.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/kkc4qgh3qv16kl58r8ggikcgin/mirofuwupoxasituv.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/tasovukitadulivej.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/593a59cb2fb9bae5bd0a6875b5381bac/wevapijunovejiju.pdfIn PDF document text
    • http://school15-tyumen.ru/f/gobogopotapuvebokitar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=canon+eos+m3+instruction+manualPDF 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_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 18044 bytes
SHA-256: 74081181044c3546c22221ca0ca4433769640b1e5b93579f8f47273b6de5798e
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 10696 bytes
SHA-256: 94829520999adc258c92aedbb086bd8c35fa869934ff93bd84e3ca5cffd38907