Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44aa50bbc5958bc…

MALICIOUS

PDF

80.6 KB Created: 2021-06-25 16:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3db8de6a051db04a6c305be4fb8b585 SHA-1: 8b4c3892a27d46fc44863033e3b9e5a417079679 SHA-256: e44aa50bbc5958bc8724283f6eb0ebbadee2d2dae78c242043ca4a3ea95a0ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially malicious websites. The presence of external links and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://crewmak.ru/uplcv?utm_term=large+furnace+rust+guide
    • http://mikailang.net/userfiles/file/20210519230617_1452096349.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0ee5fcba---3341708596.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a406423938b---kapazetesim.pdf
    • http://travelport.pl/userfiles//file/xukite.pdf
    • https://zegabilisim.com/calisma2/files/uploads/vojiwixubepope.pdf
    • http://afghansolar.com/userfiles/file/30120176065.pdf
    • https://banghenails.com/upload/file/24123643237.pdf
    • http://www.sport-konyv.hu/userfiles/file/redewigibumugumilazo.pdf
    • http://www.urbanwaterways.info/files/kelivuzebamunumunazug.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb7a7c091---94127661469.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16089ecf6ec24d---sedatelatisisep.pdf
    • https://ajitcoatings.com/uploads/delejisuwurape.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086818bd7e44---63742245137.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0dbd7736e---jotusajetanunokuraliju.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/jelulixogasiwafogab.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c9fad063f66594f8d5ab6ca39403cb0d/vozazowuvapo.pdf
    • http://angelcabrera.com/FCKfiles/file/22378886681.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa8.bin
5e638bdd546adc49f0d5aa91d72beda277a337e52ac872b34c85c089e6fdeb5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 10540 bytes
font_01_sfnt_off0000f29a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16792 bytes
font_02_sfnt_off00010aac.bin
cf7f3aaa8224376940be3540c8b17a7128d22363a6595933e904970936c2610e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 16604 bytes

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