Malicious PDF — malware analysis report

Static analysis result for SHA-256 f102f842ac84e41c…

MALICIOUS

PDF

98.4 KB Created: 2021-09-20 14:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70626637115c65b04f6b76175b12cc69 SHA-1: 4e0fe712d79e29104028d65d3674e32ba3303013 SHA-256: f102f842ac84e41c4af4633b5e8e369d1547b5cfaca07a16132681568ee8d593
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document's purpose is to direct users to external, untrusted resources. No scripts were extracted from this sample, but the overall structure and URL distribution point towards a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • 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://tanhaithanhvalves.com/quangcao/admin/file/92993624062.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681a94d9f1---nuroma.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146355d2f2a7---5277261635.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/84014826051.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/27350712385.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109201707419953.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fcf6c824---vabozikew.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/22716446662.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/88727021552.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/51657181396.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/96694476799.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/jimurefalevakoxasebu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4567efb51---fexavewoduzebim.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a01b57fc67---zolixesabololuzilinejir.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/dabiwokapekaxamapu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93128130597.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/52267139960.pdfIn PDF document text
    • https://yodobashi-church.com/fifawovisop.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/97723866040.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/vujexeb.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/54872610064.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210918_7482D1E9E5DD84DB.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/48792394082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=alexa+app+for+echo+show+8PDF 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_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 10660 bytes
SHA-256: 594601b6f499ecc773c81a2a0a11f51e101f4ecb57ed0835fbe8d270f7edbdc4
font_01_sfnt_off000130a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 19596 bytes
SHA-256: a9d34f2818a041e937d66a6ec1ecbed3015cb0b4921b3fd8a1735e810df3ea71