Malicious PDF — malware analysis report

Static analysis result for SHA-256 db26fa7e87f7ad00…

MALICIOUS

PDF

81.8 KB Created: 2021-06-29 07:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c477a894046bf0506d992a5b345d0f9 SHA-1: f694cc85e893bb381a63cacff83352ceb783ea12 SHA-256: db26fa7e87f7ad00ca6be74f46b96965453844ba2c1ae20f7cd0c0f3d1f54426
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and embedded URLs align with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63530e6125c845b65b9298089f93e97b/60371821060.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/31389178989.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/63bd310627e7b241bfe3c4a998c9f671/90450555497.pdf
    • http://mariopresto.pl/userfiles/file/14614970216.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9048fd400e---mizozax.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d69501a74---14377542374.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vj4uf745cnhcgtmvbinelad9b7/9249511870.pdf
    • http://wsp.pl/userfiles/file/29014257038.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/60feae075d543c103ae26eceaef47910/59175430575.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/vibunabizewesavapede.pdf
    • http://www.siphonicflowmandiri.com/upload/files/68078123869.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df42a4c71b---14745602980.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50c6670b40---86334782974.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba9b28b14---69218497548.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ruunnp3mecn0ah97bftu64bb71/46972665766.pdf
    • https://designclarf.it/file/mijoren.pdf
    • http://watsonwilliamsreunion.com/clients/82103/File/febino.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec54ac123---tesuvupowoxulimo.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa75b06c6dc---wibanuwovesuzid.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/lukubasijejenopebepixedev.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7u1f1n5150qc6gjmem1atefnvu/22620011620.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/afauv67ph1oe69roa2d1rnrp4c/kakezanosilozexagivub.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/mowalana.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=plus+one+maths+notes+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_off0000dd86.bin
01c0b73c9c3c0ccfa6eeb1691d3995db7054d980bed4d21014327ebadacb15c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 10672 bytes
font_01_sfnt_off0000f5d6.bin
afe27ad45a06438b9b37de2ec702a83cb78c8718e22dad6f105b57ad39e15de2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 17056 bytes
font_02_sfnt_off000121c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 16792 bytes