Malicious PDF — malware analysis report

Static analysis result for SHA-256 1551041c9c8e77a3…

MALICIOUS

PDF

89.9 KB Created: 2021-06-27 06:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4f632bb53ee022f6350800c03204e17d SHA-1: 34c42d4c926ef3860ff35189afe54f6c20a9f8d9 SHA-256: 1551041c9c8e77a3845fcec235b14924cb9cc5e8801cefe0bbb69f0232bb0be3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ujkgmq8hnsqg0pkk69vrjq92sj/melasebuw.pdf In PDF document text
    • http://orchid-daikanyama.com/userfiles/file/26380171571.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021429184552885.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/77209123c2667192c544758bbe7f43f9/86461920829.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12f83273a---bajebasafez.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/rituxinirov.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/30b003e1450264c05913ceb84a982013/kipep.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/dusuboponigixitumadux.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/50149899593.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/tukexenobiguwisageput.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1eca5efe00e3cb0a4357052c22cba676/63363234916.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501211944721563.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kiwobomovinuretimo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f45b77ccd---zoloma.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/penomowabanikegatatul.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/uche72micggi6arsr793kr7sdm/28067313746.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/jmbc6cjat0grm395dv3mfssju6/nuxosejafekipirusuke.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/95048dc7202f7b083992f9b1de498a7f/3439615993.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/053880111e5a7aa4a5b641b05c42f795/kixafis.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2d451e16d0d3275d4ec30494c84aaaef/68416466850.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/541999b39937c9f524e68cf9802f589f/wudexutepuxonitikebeje.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sotopa.pdfIn PDF document text
    • https://artbynela.com/uploads/file/98856180025.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/nupamuzupav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+medieval+worldPDF 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_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 10260 bytes
SHA-256: d84d4505efefc5c4031c4ee5e363c97b33841fca85a6b7077574e1cf6e3a90c7
font_01_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8B 17148 bytes
SHA-256: 776dbc7f86de93f751d8a4ab1421b9d8d71716d8ec769bbc820a9cc4379ff3bc

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