Malicious PDF — malware analysis report

Static analysis result for SHA-256 5917ae2e47b4d091…

MALICIOUS

PDF

116.0 KB Created: 2021-07-24 01:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 320dfc394da22455c0687f34e427412d SHA-1: 5c117439a3c2338cf888d356264e6b94ffe9dec0 SHA-256: 5917ae2e47b4d09157d7280482df439f8669c112eb959d30a9f87d27e187c14e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple unknown URLs indicates potential download or redirection points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073610f238b7---7214341094.pdf In PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/ruzasefego.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/75f90a25a3f533130888ac78bf252c1f/rofowibesodarowokuj.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/5187935774.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949f0a71e57---12143558918.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vodepega.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0301ba6ecd---tavilepabisazo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/p5h097lguv8nn5sct6dhl0fl4a/nobuseledatadalewekewuj.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/97245381f50564b413d98bd862b40f26/wuzozokaxufebugopabab.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/nivapojivadulisuxuka.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/zutifujilulexesopesejitok.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/11108837942.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b7297718908---vufunimejibixeraze.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf2a121ea---66101363829.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/7269848737.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/dawowufedefibut.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/70455207610.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/sufuto.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/fepisaxerajonoximof.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/67463822517.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/795c9e1671470bdaad6ed13a0e2d5d9f/ruranezudelo.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/6959456950.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/koxadaxudisinajuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=first+day+of+school+hillsborough+countyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FA 10952 bytes
SHA-256: 8990bf0b04f8ef91f111d269916bbb69f0934d4f20997b2a55a5a4e140c279a6
font_01_sfnt_off00015f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F13 17192 bytes
SHA-256: 736bad5b1f990d62aed4ecf6620ce51020afb900679dca4ee8c145c7c85029fb
font_02_sfnt_off0001783a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1783A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001904c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1904C 18236 bytes
SHA-256: e4f5d936dca9d8ee71bcbe4cc27b5ebc87649af27b580b5f1f1f3049a2f3456e

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