Malicious PDF — malware analysis report

Static analysis result for SHA-256 a545c20ed438ba20…

MALICIOUS

PDF

70.6 KB Created: 2021-09-04 06:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 682231dff3a61d4a2824c4513df740a4 SHA-1: 4417985afa604a26688491bd860caca9bc87f1e2 SHA-256: a545c20ed438ba201df30d0023771b79fa3edf4e675a7fb24e12387f0e5c2fb4
176 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It employs an image-based lure, a common phishing technique, and contains numerous embedded links pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of these links strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf10816617---44789214481.pdf In PDF document text
    • https://clickbox.ro/images/file/7272632978.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/salina.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/60d2fc0854b2300c7132e93428a76f38/meratusapeluzis.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b1ecb50acfb4946af870447f0a695de5/jadutudetulowomijexew.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ad9be042---zepodatezilefagirutuko.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/tegapumesusojerubipifadav.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8e3e190e06e4a4a4756022382403d5fa/38871402299.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/josaxekezigafimifal.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f064ca64---vutorikizovorowemu.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/55311568226.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/uf063i8nhiok5k66lt2q186mt2/peruzudumimazoroj.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a26d8a2da30a68874e242c2f70b6f6b4/rugugadudobowomu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-5/20210705064423941786.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/wirojobibegat.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/71146404044.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaae19e986---84891884327.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/89476500557.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072302363673499.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/127706668a7b7a77475ccf4a3b7445a8/wilanixuloga.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b069d042cc99bd3de9d963d893d43f22/diwetezefavipotelerew.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/mumifimawubiwomutuf.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073224248982---zemivudabijabu.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/dixurupazuvabozuvowupok.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a829b3947---wimigabagapuwa.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/8027495877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=botanical+classification+of+horticultural+crops+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_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 14264 bytes
SHA-256: 45fe2b60ab2f3bafbbb12978e483a42556872aaf65afd8d4776686df88317299
font_01_sfnt_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 10736 bytes
SHA-256: 98163e77c4eacee4ad686da9491a2d64e7c915bcf039c1bb9333e4de63129d65
font_02_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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