Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc13783ff647dd6…

MALICIOUS

PDF

81.7 KB Created: 2021-08-14 00:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7468478ac96952c566ef40ce918902b5 SHA-1: 89c1929729415bcd6d96b27cb7c14a7117eb4345 SHA-256: 6dc13783ff647dd6d90f67adab2f91062fb29196ac2e7c92dbe8ed6a89f2a21f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adc86946ba1---66920266305.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16103672ea46d2---zijebagofozasifufa.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/34515492070.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/nowotogedutilirepidal.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/sukawetuwenuxewuram.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/lewaberuluguwub.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/314c7db5b0b2e0c54af45b5b0164db8c/63271578899.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/7348831621.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/un5sjl867oscijoq0u52bm088a/10666368106.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tifeje.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/32967247998.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/25700719705.pdfIn PDF document text
    • http://tw-go.org/files/15158699900.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/zatox.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69856af3cb---1074559282.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aac80e2241e---19021531521.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/filuzugobitosujuwesofido.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/14431725653.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952261dc33d---wuvalarenotewutawimap.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b514ec502c3---51749261391.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6194343112.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/pariruniganowefalobumud.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nuzojipexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=proyecto+de+domotica+con+arduino+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_off0000d9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 10780 bytes
SHA-256: aefed3de242abe1f34d3a8743b6f1ca8943121050f45ffc53d4fec667cc6f448
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 17548 bytes
SHA-256: fdc821e00ef9faedb30657be4794fef50612b694424c2c8324bed558b8f4c7d8