Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b8016acc6b117f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-15 22:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dad5ef00810d925fc78c4ceb9d00200e SHA-1: 235be27601687441197468ed1ebb609f05513c21 SHA-256: 06b8016acc6b117f303278964c99db6ff49e622607eef977e22a28b94a7668b8
156 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 functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d8dad647c---3414937032.pdf In PDF document text
    • http://europavloeren.nl/siteimages/file/99140335161.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cff2fd4bd1c677c406e7f3d56bd062e3/39959217506.pdfIn PDF document text
    • https://amblamy.ee/upload/file/76429938650.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/sigijovifodum.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b5e4e052---15976951331.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_041259.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/47161387657.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/8989183958.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/39424129193.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bf420661072df92257ed30b792845681/26409479811.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be350fc2428---besanoxituxunufewan.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/e94d56c93419b0abcd224b28b768539b/zoremoxibosuz.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021516448431905.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/bujogogilufukorutirem.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/vovuvipidivapojoma.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/27840554633.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/puvajo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/884f88869b623c0a4102453fae1bfe03/tepibudisofaxenerijo.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/94919628483.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/jajuxikojotu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5dfqa9d15t6mincam78csnev34/sefujoroli.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/geviseto.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/3e7a0f5f40a54fd99d5f08a6e49b3467/76708364588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ncert+solution+of+class+9th+science+chapter+4PDF 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_off0000d3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 10900 bytes
SHA-256: 78757cd21ef76ad7d32a7a90d1f3cbcce0fc4dc05900a656d5d6c3d9441a04e9
font_01_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 16348 bytes
SHA-256: fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
font_02_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 17184 bytes
SHA-256: def1e0e0ab6628ce16d2afe681ac6720c62f6a02b8506ef15b616264505574a2
font_03_sfnt_off00012fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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