Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe256369574f1d2…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 08:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 307af2ff29eaa9bed8d66f1e376a3249 SHA-1: e4b18f4717b0c7fe0e4b4f5c8c89922cb2e785b5 SHA-256: 6fe256369574f1d2914f2f64a229835dfcf4ea6325acb2ba6ab8660aa4da5269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of external URIs and link farms on disposable hosting suggests a campaign to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=pdf+to+word+convert+online+free+download PDF link annotation
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160af77e0651ed---puwogamedeli.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/51233957670.pdfIn PDF document text
    • https://memoservicesrl.it/file/93471289426.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/xunabawalarinewofegiv.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-28/20210828030320635552.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1ca755effaac950b6c2f6b4182e68f84/povase.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6f170b53b---939756765.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/82238580003.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/97331395608.pdfIn PDF document text
    • http://boxethai38.com/upload/file/62448455329.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/99611309801.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/81697109237.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/riponefusalo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/f756974abe0dd937a9ad0e86c6a1cdd3/wiludebepupinufoli.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/79bc53416c795d60f92fd32ca2451b40/ninujupulanobo.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/kukusidogadegozomikidal.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/libutuxotiledafubemev.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c239c4d8d7c---21388552458.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/muwilulidavexav.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c274e2100e---6722793617.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/milibimogi.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/35402037139.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ac20c0f15e5bce8487f73e60f67dd68d/70829190809.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/dojuz.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/29989290295.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9de39114---ruwesamilasusowoxixom.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2006e7b993---favefobaduv.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_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 17160 bytes
SHA-256: 4d53174e599ab29511304c236595ea417cd295add928465447fc18c68e875af4
font_02_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 10456 bytes
SHA-256: 220c13fe1befc957f3e29f0e19188aea6db0200338039e9aa511eec5e4a2e099

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