Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4018617445ecbc…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 16:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 623193471bacbd6e9e4f9200f47c07ae SHA-1: 42dbb5b5b9e6773cb831a00333a17fb0e0e40388 SHA-256: 6d4018617445ecbc3d1e604f74e4512ad4486a24d4e256ec1596c0daad60baf0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://inwebjor.ru/uplcv?utm_term=restart+in+safe+mode+android PDF link annotation
    • http://zabbeleecooking.com/ckfinder/userfiles/files/26014614697.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/69681623613.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/29387140103.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/vafojaguvixetokigivejodi.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/duxapopa.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/94223118366.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/08/file/20210908_032706_120.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/44646311261.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/7606758654.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b32f42a44---tepupo.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/kibuvopesuzu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144238e2feca---gatujizusilozuzixekixo.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/93555887128.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c041061583---metupabikivokejuti.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/40813828810.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/balezu.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/sopiw.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/18391062651.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kiwudatikapuvudozas.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631177245275779712.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/70402643932.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/furelapadebunatikog.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/76e1520911a3ca5392270ee265e0646a/sefalasudu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kuvowosevobuwivut.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/34093458193.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d9d8da7cd6df28cad2e88ad929afd2fa/93454054531.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/molanotokomugujijifu.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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 15392 bytes
SHA-256: 552fe6dc744938922d95b93d28e8ff7c81592f5a2385375c4092e0e71cc1e03a
font_01_sfnt_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 10516 bytes
SHA-256: 4aa91fc26d2f54f54c9b0c0aab9d1bdd4674a259e6f3484b7d997bdd463e8f3e
font_02_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1