Malicious PDF — malware analysis report

Static analysis result for SHA-256 0357b55bccd725a7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 03:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ccce1a2a7f2c6a8e33e1c0ae25af911 SHA-1: ddc52d5a77608e6748ed1e08b567bb251727f498 SHA-256: 0357b55bccd725a7e78d6f48e150bc58e172918917ed0bfac63091923d07bc3c
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The PDF contains numerous embedded URLs, many of which lead to unknown or potentially malicious domains, suggesting an attempt to redirect users to malicious content. The presence of external URI links and link farm indicators strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://minhnguyenvn.com/uploads/userfiles/file/pevixajujobekamijesewul.pdf In PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/xegufazazukelesonujarixu.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/67222265325.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/figapukezeve.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/vedigusotoguxonuwanowexij.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/pezavowuzed.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/56767810152.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/1945580164.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6fec9f69939ca6961cb2e523ad04cb81/sejonekaruxex.pdfIn PDF document text
    • https://subarini.ro/mm/file/65994336032.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a7778a6f3fc0177dab27ab6cfc34323c/31834660718.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/17041677795.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/kiwevowagumipomalawarot.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/e71e1da2fa8cfc6e86ab9247ee75010e/jexefot.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/68b9af56839e73521d7828fe06fc8558/29089727813.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7efd022c71---16073756070.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/52401699007.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/79086166359.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/16081968760.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/u7gjrffeco9e9mvuqib93ktg3s/rutuwadalusida.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9346a113e---velodojafepafu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f0e4d18363c2245e15c72cfc937e0f2f/naxizodejodaga.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5fe9ff23e752f09b0212613f8739fb7c/xupawudifigolofugoweloxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tatalaksana+cacar+air+pdfPDF 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_off0000bcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 10416 bytes
SHA-256: eda4b32815ace5ba5d5f65186963d96994c4894616cab4398a81ddaf12b5a3a8
font_02_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 17140 bytes
SHA-256: 6905081a145dcab6ddbd29e2f258db096100b26881d7fe14de609799ec084fdc

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