Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16aa8744289abe7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 05:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 070fd1cc3fda2bb33c32b8199b9f6bee SHA-1: ae0affb68b3a5546a11384833072bc78555d8e0f SHA-256: a16aa8744289abe78c4a8600b05e6fe0613ebc7ce68b40659daf96854ff1259a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://accu-split.com/userfiles/files/16467308185.pdf In PDF document text
    • https://dineflon.com//files/79982315706.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/rutunelolesaro.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8038cdf94b---terosowedeb.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/81531772729.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6fd25e377324a387df1b3e7e87bfe5a8/jowuniligu.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/73825426814.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/nukimexebe.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca110edd8---39647730736.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/sewig.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/pipametagefumunuzekusi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd0d4a4ad---37012419012.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/10730656583.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/muvafom.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256b48848c---weketupimawujosusomiju.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d35c51a9a---1717122400.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a23aa50788a---burobewekoxegidifinaf.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e889d46dcb---54104258931.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/a9883e5dd5c81f63dd56fa0dfff5ef8b/64470525800.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a695624b7e8---kugebum.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/27094393921.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb196158d4---43277214642.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/powupolasojez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=health+related+components+of+physical+fitness+are+most+associated+withPDF 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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 16804 bytes
SHA-256: 4f54d4d3ea7cf701e165c24d03a8ac0633c30a80837bd9d1f435437da72114d1
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 11076 bytes
SHA-256: fbc2303cead80c108815fdc53e7d7291bad5477c910f9e88ab77ed6a9e802c2c
font_02_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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