Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe807cc7a578c21…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 21:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0d163bba181a75636f2eea497605b59 SHA-1: f4612971f5ffda24318f416cdbd71e8e10d15ef3 SHA-256: 5fe807cc7a578c2184356a9dbe7d323ba9e8a4da62d013c265d522c7c7ec71cb
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest the document is designed to redirect users to potentially harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4021755ff---34449592829.pdf
    • http://ibtaker.ps/userfiles/file/jisuk.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607111edb04b3---daguxekekido.pdf
    • http://www.awakohchang.com/image/upload/File/ujuxatinixivokofojotuziv.pdf
    • https://bazab.ru/ckfinder/userfiles/files/zuburu.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b8r4ffolqfpjedu39inhi5u466/50382688959.pdf
    • https://thucphamtruongxanh.com/Upload/files/44718475833.pdf
    • https://daiichitravel.com/uploads/news_file/zevebe.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vm4j4gbj9qvg5pcj2aqenv9ep0/togixibarumafimiwew.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/137f2620da45bfaf44be4fc9b1c2031f/54628584804.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6pkvpicp4j6q7h8718qdu34dp5/mazevurizile.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f219f132---kezimef.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91d37d4c4---70415778934.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077eff11aeab---76306665732.pdf
    • http://ahlhy.com/uploads/file/30132301932.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6e449fb0c---84842471374.pdf
    • https://aprilboya.com/userfiles/file/jineboruteresepomepid.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/rrkq3d958b0u7vsququ68q4tvo/xukupexenit.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b404edfe1---fegop.pdf
    • http://k1a.ru/images/files/file/3839502533.pdf
    • http://brianhaymore.com/images/e/file/gujutejosigulidipepodu.pdf
    • https://planet-for-events.de/userfiles/file/87313758124.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a8bbc8a599b4239336995eae0205052f/resosavifaku.pdf
    • http://burrburroughsfamily.com/clients/55468/File/18391595083.pdf
    • http://mdfgiare.com/upload/files/94891719483.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=knx+handbook+for+home+and+building+control+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_off0000e893.bin
16e25d0b12145f5c37ce70b1a624ea4bcaefc830161938f85c854506a87c311d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 18576 bytes
font_01_sfnt_off00011933.bin
27f670c173b31ce9b0867617f1d9e7e999950bd6249a60cc83df3a958bc370d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 11324 bytes
font_02_sfnt_off0001332e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1332E 16792 bytes