Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8bfc352f43a947…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 23:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c33f6c9d44b12215528413f273dedf64 SHA-1: 9e6c5bf336c555e953ec4c65bb4100e8b488efdb SHA-256: ad8bfc352f43a947eb3801fea0d00563c41761b65e1c6ef7024a728e74524f10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure 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, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://permargi.com/files/galeria/files/gudofafifilotar.pdf In PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/roninigibu.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/10598502074.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f82de4ac---58097643527.pdfIn PDF document text
    • https://masihpt1.com/contents//files/somepajosaridesosotezivi.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/lokidejosumuxesiw.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69f9e970fd---62459074694.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757069b0ddb---xebelurevuw.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/zotiginomobalefeguzemebu.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/pirasi.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/35805586457.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/b7e7c4f4b31e46e302375e6b3e888861/4741186966.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e8dcb4983a12db3b095d16711dac0faf/25649238470.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4ef7e73e3cc798f617d3e7edb8e4dd20/lizasugaforajekuxorikilu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606db7e83cc18---fisifopopawiwu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48ed10030---rekezowuvopop.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/38385429114.pdfIn PDF document text
    • https://paradigma.bg/uf/file/papukesatikokojurosabe.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/88201157403.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6c1dff29---47565782923.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/55992476752.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6f5d1c5482f02843a8f62580995b053e/susafabukomusojez.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qoe05o8mklk8bn3da49bg470r1/36274595764.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7a2e749974888b5459366dd5fa97b065/wuwowomazurugepa.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/47911743367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dictatorship+definition+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 16240 bytes
SHA-256: dff2c0c40571e7004d8ff45c84adb427f33cdb6edcdb302d4489514ef169a18f
font_02_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 18412 bytes
SHA-256: d914d9ab77f92749b0f173fb7b81fd14fbf959ace7b3abf15123ba2eaac4dcc8
font_03_sfnt_off00012d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8A 10672 bytes
SHA-256: 4c68f8f84f890d24037764f6df75fecd9758a4bb189399926d9e0ce77fc03b4a

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