Malicious PDF — malware analysis report

Static analysis result for SHA-256 08051acf23741335…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 14:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 207466eb8e5d5308c17302e58642ee3f SHA-1: 0251d05dbb0f3d5031b26d8cdf3e1a582137850d SHA-256: 08051acf237413358b397befeffc98b3bfe558da67223a04f74a46e901a542fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=wreck+it+ralph+full+movie+online+free PDF link annotation
    • http://teewer.mn/ckfinder/userfiles/files/bepubumowutikotiwiru.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8e3nulcmjnoddphmso0drthi2/nawuderewasirimexawu.pdfIn PDF document text
    • http://chemsdano.com/upload/files/55900896938.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/dodusofi.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/85476284789.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/61059833680.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/lenigulafoji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c99769721---rujavijunizudafapana.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/devunekiwatiko.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/49818694877.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/91116736309.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/62424461024.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/sowaxaruluzinef.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cfc830e231426b0daf72e2e0382c4072/jovopapesavafeler.pdfIn PDF document text
    • http://195exim.com/datas/files/belebesorugesejilelo.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/39466657905.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/46513702402.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/33c805bf7f052e494578d72511f30c9d/fujipes.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/tibar.pdfIn PDF document text
    • http://chipgene.com/image/files/20210908_055847.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/68019492663.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/53694823195.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/jilotupobiv.pdfIn PDF document text
    • https://jurad.eu/files/file/dibanupakerefupobuxinawi.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_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 17300 bytes
SHA-256: f91a6d214c2292a58471d32bd47130dd8e361f0ad5ee0268ae01713d6f2d1d8a
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 10828 bytes
SHA-256: 7a4d51a043832ca05147d59898fe68516fabd6c19d476621bcd75e58e4ad0288
font_02_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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