Malicious PDF — malware analysis report

Static analysis result for SHA-256 9607b20ba6c61aa5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 00:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8da0bd65af5fa55d11fe7381bb77a17 SHA-1: d448ff97fff045b40dce1915945b3dd0bc3ef94a SHA-256: 9607b20ba6c61aa525c7697b8a8fda4a525d5624c09306fbb3e216dd23b2d421
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's designed to host a link farm, potentially to obscure malicious destinations or to leverage SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2022a5e6e1---88262389589.pdf In PDF document text
    • https://forssh.com/userfiles/file/36565381426.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/dca5d7c0435b2781f3742847f7dd6984/53308587274.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0bcc38625---32181758505.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210824_AF65CF97E6B6E242.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf5ef8b89a---86732617785.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ba78f67e88d05129bfdee2d96eac6d48/nivugafuzirojura.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcd4928dd---9906414129.pdfIn PDF document text
    • http://freeorden.com/media/file/33672792796.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ade38acd69ce4f058e41752b56b8b904/vojimekexofu.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/95146583664.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/90600194575.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/nugexowowojoraxiladago.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/27259671458.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210808021242_j3bcha.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/loripideredazenubita.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c4188dc7---tuvuludobideriba.pdfIn PDF document text
    • https://zzwgjx.com/d/files/4085739259.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808440c94e4---81271937264.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/83272986361.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/zesuvabaz.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/44250467263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=intercultural+business+communication+5th+edition+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_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 11208 bytes
SHA-256: 04f1b082669ed8a5cd3574ec6e134af151e7047f40acf875b2bbedad8eb07e17
font_02_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 18436 bytes
SHA-256: ffc2cc8ba451a57a2537949ac2c8de14d25f92665e388223188afd171fd0e06c

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