Malicious PDF — malware analysis report

Static analysis result for SHA-256 4606556a3ceccef5…

MALICIOUS

PDF

103.8 KB Created: 2021-07-04 00:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8358e5753f8c5b749a5f9d2ae706beb6 SHA-1: ca6e6aed76e7236a2c06cd951e4a25982083a778 SHA-256: 4606556a3ceccef55b0ceee98308c925617261f589835fdf681e2a18a4eb1542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=you+are+given+a+tissue+with+its+potential+for+differentiation PDF link annotation
    • http://arniestribu.com/campannas/file/gepaketawata.pdfIn PDF document text
    • https://termocasasrl.com/file/27319683727.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/4b2a8c0f5654f1cc776a37bca6b95d3c/vixunovur.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/54669235624.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/ligotis.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c480783351---valufavam.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/85514750286.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865dca9eab3---86027762865.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6545ce57c---zefekobovebaniwub.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/24903196.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/30360189902.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/87cbbb4ccd131af43d0b7568527a0630/73702772825.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f591b53ce6---xezajavupixaxokuxav.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609333681c981---jomixufumaduti.pdfIn PDF document text
    • https://777mto.com/contents//files/jawediwuvaxutudobedo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/libezudamoruduzusanusupet.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc90b5ee96---7686887513.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e06b5288c---42276767123.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160757588ed739---63475583835.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c41b09b0bca0e5e8f5afc9c465607b69/xitorulawapakujor.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210701115830.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/zoxubaxilat.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 2252 bytes
SHA-256: 09addeb75f39ef01c72f38ccb3b1c9f6bff4dbc821359ea601ab83b7620a7d65
font_01_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 11012 bytes
SHA-256: 4804e787d322ec538642a9c4455c134a125af87bb1c7034e4b814e79961eee72
font_02_sfnt_off00013138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 17620 bytes
SHA-256: d4a1a472066e5b6d92da4e43666831b74ddd0a361359da67af67b788956aceaf
font_03_sfnt_off00015e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9E 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_04_sfnt_off0001763b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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