Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa26a26fef3408e3…

MALICIOUS

PDF

80.5 KB Created: 2021-08-25 20:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 22857daebf69cc74bf826e6d44f53a15 SHA-1: 0976f13184d56cf2f47a0042c6af77c0d0b246cc SHA-256: aa26a26fef3408e3e8dedc78e1e79042cf040de3f44fe2c1acddb0f50a6c176a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted for duplicate object bodies, which can be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://benthanhsgfarm.com/images/uploads/files/37718565545.pdf In PDF document text
    • http://kledingindex.nl/images/uploads/vawoworebesagawuguvo.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rde2ltbj3291s5ijjjju5494db/49069448918.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e92b96f9c---patofabawif.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e27ea701d---67423842221.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/kufejefiwubemago.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/tavefiladuvafokesaliw.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/pexijuburenesunej.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/foboladudejojovubixabazis.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pegilu.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/36235951086.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/6496545768.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d7410b9f3---29906983218.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a12060a04---watunubojuxomojasilobu.pdfIn PDF document text
    • https://pecsikult.hu/files/file/83664798514.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaa9422074---8522213351.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/cb30240adf33b64c903325f93ac2b3a9/sumakatuweviwine.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/afbae9b1a34df748e7181b914608b2cb/69040345038.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/wivewusaxigujam.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9473dbeb8b0c747d535fd0e0b52a6dc8/86988575016.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/vegoxaletokametulukuxase.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/89304449709.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/39853025598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=good+to+great+and+the+social+sectors+jim+collins+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7d1ee9954e098d2d8e323e5e8fddc568/lejadezi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 17596 bytes
SHA-256: 9088b41940eda44189e86b4b66f24fc188f834d392b03ea39f42cf0a380b996f
font_02_sfnt_off00011a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 11236 bytes
SHA-256: ee51051366e26c3a7cbdf10b78251e3161fa2a1d7e1bbcaa24af32a9d3566c08

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