Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6eb861fb779662…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 10:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80c4efd7c7306ab8452edbfd7ff1fd3e SHA-1: 5aa0762eff026763656a390801ce06a29fd91b31 SHA-256: 1f6eb861fb77966274b4ba627d7a81dc8b71f810f3d6f8bbf72648a8a272d62c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The presence of external URIs and a link farm on disposable hosting suggests an attempt to lure users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131721e7a013---nizigatipugibuvagifunuwi.pdf In PDF document text
    • http://srilakshmienterprises.net/uploads/leribenodurobogeka.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/35506218991.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/zunokapuwetuwuz.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/31216402574.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/maworibelu.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vitiwige.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/wumuvotedet.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ar7a7ucnjqm5ud0u5i61jjt98c/vumafudutodipixerure.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/wikuvavukutofo.pdfIn PDF document text
    • http://btfa.tw/upload/files/63548309988.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/11889954313.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/65989301863.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/diwosepevixeredaju.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/kusirubizuwibosujo.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-6/20210906055107757264.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/nawulenewurogofabozusunov.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614273bfa8304---vofukapexi.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/77421487526.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/ledonamipoxulezefowam.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lqgiddhr239pitia5teieuef4/rabuxovebimajek.pdfIn PDF document text
    • http://groupkaishan.com/d/files/bowelipe.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23884040906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tempest+android+gamePDF 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_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 16928 bytes
SHA-256: 15434aac2cb4c54961e137ce81a367322aa578a3ce77a694e980032be31cd761
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 10652 bytes
SHA-256: 830b326189ae4f311e1ac2c58421f6db07579222c4380e69cd9e1dfe00f7833b

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