Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7b8771b4800778…

MALICIOUS

PDF

90.0 KB Created: 2021-07-15 20:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c5f200df434dd8f1b081adfe3678fe0 SHA-1: 7ee01568d35249d724e14678323e62bfdcf97f2c SHA-256: 2d7b8771b480077859a685cdd3b6291952a2f3d4cf1766be266d8c8e24e9d50b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wasserburg.pl/userfiles/file/33166926417.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a94e6cc8d---muzesojop.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c754b58da6a---84767903314.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/9e5268e3a24fef9cb3c9dba881898077/56287107716.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6863454f5c35ed8e66af31062a675cec/30053708393.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ub4ilog1k56iovq6k9oa8b9s87/16986459630.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f393ec000621753c134dcc5123d93f69/duvupigukosuvuji.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e03f1b173---pupuzuximilezilaxosuxivat.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/89837582221.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/31943443091.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/27677918286.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf007ae7454---85085814955.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/nofurezowujobovox.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bfdf7022f---dovikikowevezuzawuloxi.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b6065c4287208530b75a5ff88fffd7b8/jajogupatosebokoveveregi.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/2625706722.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bc53bdec94e1bbbad5ed0418ec9257db/luberefunuxitobuvaduxireb.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a813ffb3826---73628317413.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/daroxalenezi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b1396a5b7d2903a71d2328b98c666bed/zulenekutawotajilewazol.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/rigovawifila.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/fexiwibofoleze.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/nuvemaromusolum.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/mubisof.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4289473d81d1f2715a460cf16f3708f5/9488466163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sometimes+i+willPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 17492 bytes
SHA-256: ae45533c6c5b90b2a8db0af8e555c0918858a3bf5342e6016e9f52da51e98c34
font_01_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 10064 bytes
SHA-256: ed01f6d0d29a990d788353525d49960f6f802412d302ebfd8267db192a4cd22e
font_02_sfnt_off00014435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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