Malicious PDF — malware analysis report

Static analysis result for SHA-256 783220294a6d48be…

MALICIOUS

PDF

83.7 KB Created: 2021-08-17 20:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1b0d2f1e6fb2587c40fd2023b13626b SHA-1: 98aa06163e8c73148e0f85556c602d4cb901b040 SHA-256: 783220294a6d48be4305d9b6082bd4f88b994298c233b7ae9285bdd48603de33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous links on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b26c520f84---93558663095.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa813496d9---tawajekefuwizudisa.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/vakizomibapidomorol.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/f78s13drmm6bngtk2ljh74klmq/48161242955.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/vaxejenaroxebel.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fmcu4tg9q9jsrp9b565te19478/kulatividokusupunafewuwi.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/nupakiteze.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7ac6a1ad---tifipuve.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bfea8974---78042221295.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/3999143389.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f46d6664c---21795484309.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c7db6cca455417fbd2cb432dae8e60ac/wifizemugir.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/53478747942.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/65351987973.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/lasitorev.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b7c2eed78b6021ad879c0f0fa0bf8de4/44904544252.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/93259716775.pdfIn PDF document text
    • https://goldenapp.net/file/nidoxokofuxiw.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/45097338917.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02f140503---75038615970.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0pbf8c0mbpgajg9v7dvi61ofh/74445901957.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f1eb26c78818ed4f8c3d248c3c1ae794/34627939733.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/81827406320.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff942a24ebf---biridatelirovewazexusa.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/07127e752103a0a8f90daed07c72fc3e/34468933026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=alphabet+matching+worksheets+for+kindergarten+pdfPDF 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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 11368 bytes
SHA-256: 8d1d64a58dc7f6e0d99361507d62c4bcd0105ce8357312b96be2619d83483cd7
font_01_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 17132 bytes
SHA-256: b32be6bf541b8c2a2da5cb1809b6edd1fdce8b619adea23693ef9ea553c0bb10

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