Malicious PDF — malware analysis report

Static analysis result for SHA-256 1511360f0fbc2ac2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 10:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8d290830c151ad8aeee26eb1b545f5d9 SHA-1: 3b4e251384e9e9a20f59135d49accb19ff31ccb7 SHA-256: 1511360f0fbc2ac2d48eba25f416de8fed41375139735c4cea13401f02d93bee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/df019bdeb7af3f683a5dbaea83f50720/12734631249.pdf In PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/lelatowimazumafo.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/nosikavef.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/wetedoziwerixonexagexa.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/9risql46s1kfj8cdrugc4121df/palizaluribopujaviwasire.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/foxujifowevukumuvuvuwoxuz.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dawunuv.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609427c92120b---48932468351.pdfIn PDF document text
    • https://masukpt2.com/contents/files/2441831017.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1e58d4cc---63475981805.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/97897945344.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/erblkd7fd6b7ipr6sc0nd37for/gusigabededa.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd9a0bda2---sixemo.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210629_C6EAD3E7ECBD1582.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/26807850582.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/74737346481.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/zipodutazedeladigu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/28263041883.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/77590841441.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/pibuduzo.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/58113289816.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/82401268159.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/40487615010.pdfIn PDF document text
    • https://dafelia.com/files/32571919267.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/texus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=whiteboard+marker+out+of+clothesPDF link annotation
    • 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_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 19308 bytes
SHA-256: 1cc04d71bbc0172aa3f61e9d40a3f2040597396892a3ee914fbe890e1f17f789
font_02_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 10960 bytes
SHA-256: dec4d5b470700b9c905be86e642e6b8421736032e04fffba38aa31db252d3e11

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