Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab637ba8bd6effa…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 19:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2479713800d5123275787e6a83f85118 SHA-1: d9489680bc2ce4c56b1ed9e3520af3699d1b767c SHA-256: 0ab637ba8bd6effae0fe64e3767ddcb715bdf3ce3c5fd5da901c04cbd87cac52
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and contains no readable content, suggesting it is designed solely to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2ffe282b---nusoz.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-9/20210609003820892075.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/fiterute.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/43538428271.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0514f2b19bad4cdd58a2e4ab6f5e977a/31351967394.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a1c6be71caeda0b1a4ab88bed4467094/57319040167.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d60438f172---53218180609.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/55b638cd45f4ccd8e7e68e0ed94daee6/rudavubij.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/3687396404.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8620e031d---viwiwaxivojulimorigufag.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b08dee3f70c---32759230673.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb035a5245---ganafituliwiwid.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcfc5263b3---38481808719.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/9420025861.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ada69a5a1---56127325533.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/fb7ff8adacea99e85cd51e95158a8ebd/fefisumizugajufodusi.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/xosogubepezanisobefirete.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b629c16c749---19006298997.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/delori.pdfIn PDF document text
    • http://rts-3.ru/upload/files/83839577820.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/leguvaderafaxedifimawi.pdfIn PDF document text
    • http://waterreducer.cn/d/files/53361093084.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/96bbdf6bf8daaeaaf7e4644540fd7356/luganixirumunavubawoduk.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210614012330725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=importance+of+push+and+pull+strategyPDF 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_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 11140 bytes
SHA-256: 404884af6222fe62ed334213cd58a2b47ff1f18852ebb349dca6dd7f586650b3
font_02_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 15856 bytes
SHA-256: e865a39f1ce1c2810ad225a1078a7e93186dd10780d7109d1e442890ea842285

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