Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c105c598266d26…

MALICIOUS

PDF

95.8 KB Created: 2021-09-02 22:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ca4fd3187191891aed054842f04c5d2 SHA-1: c23bc2539c3e68ae14119ad70a5e677d5ebf5f0d SHA-256: 45c105c598266d263c6ba347c04c458bbd8441ccee5588b2f329d079fb118da1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. The file functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. These linked PDFs likely serve as lures or further stages of infection, aiming to trick users into downloading and opening malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://qpshouse.com/upload/image/file/35915169085.pdf In PDF document text
    • http://aihyang.com/userfiles/file/fuxazijasobewo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec2232686---21448153900.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/tupugutiwarevotumatin.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d15853c8550af9406b578f4066344fa/29916819048.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072d09c458---xuvuvolamapoxumeso.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/8560917869.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607436efc37af---95802463136.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16076de0a8e9fc---11809393590.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9b1e8c64---50341574553.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/wonawapovowisosukuvos.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/68547244707.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/36039103105.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c5dc8550acef1743c3b895de8808c788/gaguvaferomet.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/laxefegogivatu.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/zabuwajupapexatetojate.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127752dad45c---visatodewozuna.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/lematobuwenopozilawam.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/semexudoxinogopanog.pdfIn PDF document text
    • https://panama4d.com/contents//files/xibome.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/pumawotilosiwosapijeri.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16098b8b9d16a8---63002520866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hydraulic+machines+fluid+machinery+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 10872 bytes
SHA-256: cf7295181f6e706840beb0866d6db655944f4cd3c196857f790352966387b508
font_02_sfnt_off00014155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14155 18528 bytes
SHA-256: c60c1f31b83999d881d7261586f46407bd909bf3e9956f11be3e82810e02e535

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