Malicious PDF — malware analysis report

Static analysis result for SHA-256 505fdef449750ae9…

MALICIOUS

PDF

78.4 KB Created: 2021-08-14 03:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22d1ec938323afef382abf472d3178e5 SHA-1: b29d9646d06cf4a2803273dc03540bb19aa633ad SHA-256: 505fdef449750ae99ee574191508502435a77ccd0a7854bba93346fca4f1cbe7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable.

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 http://rongqichem.com/upload/files/bazuxuletuvozabe.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/zilitumopuzevipenomezun.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/9211155531.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/fizatelomamomamedubagifi.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7d42c0c993c157c8d48aff5c86b0558d/36759061368.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dp9a52ehla8nnl0sqr8k4ihv66/tadopifatexunuluxirezoxe.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e1614ea5---36008725660.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/83814547801.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/26d39ca57fbc57d73861e5ffb0c6d74e/74299045016.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/65103888849.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ebet.pdfIn PDF document text
    • https://loctra.net/userfiles/file/xudegisavudofod.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210707/file/1625629972.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d206a53c31---3265237932.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/7116822259.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5v1maq9vt30907d3ol5s5gf572/13887336695.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078d0c587a9d---29225892372.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/76257417887.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f15aad1e54be7aabc34bc3981930af9e/kelaforugoliworewonupop.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b51aeefa6---bedebofojizoxejekiduzid.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36995129058.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vtrrj6eoddjf1cim2bbjotjf5i/90144695079.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/zujanarasoganogala.pdfIn PDF document text
    • http://ontech.vn/images/ckeditor/files/juguvexubixexusogawisudok.pdfIn PDF document text
    • https://digireg.org/upload/50505173711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=wordly+wise+3000+book+6+lesson+4e+answersPDF 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_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 16248 bytes
SHA-256: c077d4bc1a9eea5e0212ea9e0814c1fb760d9a45aeb71e5e90ff9f0e8a238242
font_01_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 11108 bytes
SHA-256: 0ea4c4e1c7a28d24b2f3a607e0d431ceaf9a232e72cec4096a5e8ea95340f8c9
font_02_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1