Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fa14363986e6e5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-14 22:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd2a236f4455e60e56f6be5c9a3df4b8 SHA-1: ae1e66c24b0ef68cc8058b05850e79b5cf1d0ec1 SHA-256: f4fa14363986e6e57cd40d2d899f97ba82a9b7d23bbf6bcea1e5e0e714d452c9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by an ML classifier with high confidence. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these links. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent, likely for SEO spam or to redirect users to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://digiconelectronics.com/media/fujajoru.pdf In PDF document text
    • http://nanouklid.cz/upload/file/vibaxobukor.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/59828599815.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/picm6o8r88avrvrcpmq5tg5e51/bojosolug.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/fepovobififumov.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/49102636554.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134de8b94b20---guwexetezaridukefewep.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/34595773583.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/81691147166.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109141042435902.pdfIn PDF document text
    • http://unsersohn.com/images/file/buguzeziziramatoxufuxape.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/27445193550.pdfIn PDF document text
    • https://heyratacademy.ir/file/fapogivoxikajutibosolalil.pdfIn PDF document text
    • https://chp-travel.ir/data/file/xezarepinuf.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/gokizizibamoxukoleroma.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/59600048439.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-3/20210903094923122997.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/vemotukopelorine.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/40082500537.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/47896435168.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ca6cf6101c02619f0053e6afb4b1e92d/kukiparukokiwepewedu.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/96992027645.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/bimogabunesiresit.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021981259348297.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jepegak.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/7032115542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=deleted+pictures+android+phonePDF 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_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 10712 bytes
SHA-256: d24bcd440035194764dc8dd11d704f216e90a496abc71e675e16bd11423dd50b
font_02_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 17620 bytes
SHA-256: 11e674ff76354d2f659ac3a3e8b00f4625def839864c86b3416f50226cf45986

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