Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b399ee74bcd73fb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 07:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fa6a926a26cc399f525e599483717c3 SHA-1: 0af3ef4a2d9db271d7a34eb0e9c055217b1eb1c5 SHA-256: 7b399ee74bcd73fb85867f9eeb54ce376c6de45ef0689668bacff7a00dd40017
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many hosted on compromised websites, suggesting it functions as a link farm or phishing lure. The presence of a 'QR-code redirect lure' heuristic further supports the idea that the document is designed to trick users into visiting external sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=javascript+create+qr+code PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161402d5746f70---sinipemapuwomikoxeloren.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/79813547379.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/tojugavuxirirajamop.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/perix.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210915204905990671998.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/30950760533.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/wojepagokuxivefuwuku.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/42382545264.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/91318298825.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dofuzewu.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/43822540505.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/nelowixumoliseworurunop.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614440642f425---36490044942.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/vuzewosekid.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/6877338837.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/gafomufilek.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/fijokepakufimo.pdfIn PDF document text
    • https://andana.us/files/files/kerimavamere.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/47018256509.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/vowidepu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c90eabac0715c40c8c79a65c42e8fe06/rolimaturoginogeneje.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/dupus.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/pizizudufado.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/gitivejukizagijej.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/6894326711.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/mudekigilariga.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/37779737395.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_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 17924 bytes
SHA-256: dc8d02300df4181b1bfe32fa1919ebbff2acdab06f5883330ac07bf61aa95d65
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 10560 bytes
SHA-256: a05e823edfa89bfda8c54018ecbff9ced129445af80b6a94eaa293db25261613

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