Malicious PDF — malware analysis report

Static analysis result for SHA-256 50848b866d8ee51c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 04:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 80ea485632063bb79893cab50882f0ba SHA-1: b72892a3476db7c4eeb0c224e13707a0ee68d1fb SHA-256: 50848b866d8ee51cf7b9ac3b03cade327af74653e5f0b74871191c07bfa63461
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=gmt+to+cet PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/29dd1572312c26a2a09c608e6ea8112f/woposime.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/59700013919.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b580c12ba---68678430067.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0712db8f17832d7adb7931907ca1004f/rujijakaxudarunew.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/67049864402.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d404cf3ba---liniwogebunupewa.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/84338013512.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160729fd06c131---fogalunimonomeb.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608135cf1c46b---vudikan.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/dujazasejefureganajume.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/vuribomifimefi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/bd7f9136835610251ec54cd2509686c0/xovadi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba52db47599---dulonajoma.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/entjjd6mao85014gq7fken4qum/67989464239.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/24593556861.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c879b58bb6a---wifiliwutiwazutiroguf.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/25252652822.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/74843383062.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/ramerapavarogu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/refatofasitemadinikig.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/geguwijugamuwujizizovil.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb87769a7---32728907097.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3882a79c20f57346f1ce79e14ea117a3/xeruxuramejofebaxosaz.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/ripebeworomem.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_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 9760 bytes
SHA-256: 6c3b9a5903b3a3a587b6b90a023750ade996d8362f8a77e2baed1ca3a63f80ba
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 18376 bytes
SHA-256: dff8b411ffa148b85689cb45bc8cf258862df2a79f702d9a5c40a65f465a1bbc
font_02_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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