Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c72054f3e5033bd…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 11:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f353a03453d6c9368f7a48451a5c4093 SHA-1: 919fdbc6d73ab4abc4d76231a60e7e2aa34d4f82 SHA-256: 9c72054f3e5033bd562eb6cca5a5b0238ab0daca1d48322d762cca26e96026df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://automsystem.com/UploadFile/file/20210527212831779.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/31439732f000121ec3c036e2014afbcf/turofilejodusanosigavuvol.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe31ba335c---46596758738.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c190d4731d9d9fdb4cded3ba3799a9f3/bibarusodezetugumolep.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/39049647249.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0708bb0e---43280904959.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/makogojuxese.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/84715517242.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/borajedu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/rogunuwogejitawuvaz.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8f1739a633b59a0b5a5dee27c3e87c7b/60975792318.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a762d5671ef---43094738664.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kamomar.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/diganujamatexomoj.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/keludofoxumamixewasugaf.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cb46355cb---sufojuradim.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/49314887038.pdfIn PDF document text
    • http://prestopc.it/upload/file/lulivifidoleraso.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6907ed56---fuladezojuduxoxe.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9d2c417a---11402729734.pdfIn PDF document text
    • https://forssh.com/userfiles/file/78536019226.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084578b10c67---potonajerefalasonivi.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/19226412467.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/44088735975.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8fb8c68f0457cc751b15753535154b83/27268082051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+an+auxiliary+boilerPDF 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_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10652 bytes
SHA-256: b412482bb2922ffdfa83335315d1e5c9087e0300d2f826e0bb37672f629f23dc
font_01_sfnt_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 19632 bytes
SHA-256: 7fb0ab14fb59b946776fd567d0552e65346428d6b7823b5da62216f846224edb
font_02_sfnt_off00012eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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