Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbd9f783ebcce61…

MALICIOUS

PDF

76.4 KB Created: 2021-06-26 03:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e584f48a93f0f99e8bbb5cae7395356 SHA-1: 4dd3d2fe4a99c084718a7f8054c28839cebee7fc SHA-256: edbd9f783ebcce61af3c1e658718407921a75f7e0cbeb79f171e98cf26b18bbb
156 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 malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allseasonsart.com/uploads/fck_uploads/file/55513762099.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1cggpl6nlnafsbhmlonojejr0p/80985432346.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af697f62eca---96403649130.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e359efd15936a7721128f7f79be8abf2/31499698946.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/vitufamave.pdf
    • http://short-story.ru/upload/file/mikoxag.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c092b89a81a---baxoxopelalazefulo.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/08ffd2850cf9614a5c5ba9a05a4b7fd7/76936328559.pdf
    • http://say-international.eu/userfiles/file/buzorazo.pdf
    • https://travelworld.ro/userfiles/file/kuxoluduvebivopuwunarodak.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/40c70c1bc85b3ceba4ad360ac3fcca4c/56761611480.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ve8m3p1soddfkphfjn32qava9v/16380948998.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0d3ea875---paronusutaba.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea68720bcc---zijed.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/pudigapaxufu.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb41812f0---bijizufux.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/41205328420.pdf
    • http://nowyhotelik.pl/userfiles/file/zixal.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489ae19d98---xilexiwomatuxiboda.pdf
    • http://beastyenergy.com/userfiles/file/fajowebezorebi.pdf
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/2587194393.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/39212054889.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb06488476f23457f51b513d6760997b/metenanunuboloradixopage.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0c8afd77e11031be59145336c458d6c9/degejanonarupigegowobo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=inductance+calculations+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1e.bin
49d749ce860977230d43dcf40a826d08669cbb3e2af69bc73d6d6dabcdd11215
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 15856 bytes
font_01_sfnt_off0000f3fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 16792 bytes
font_02_sfnt_off00010c13.bin
6b6d45b19b3ca0ac52ddf3152b8cbf07798d8fa71c15677738389bf3da8c1add
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 10564 bytes