Malicious PDF — malware analysis report

Static analysis result for SHA-256 175e2984cf1be15d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 00:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c16ccc33298d6c58827ef73243ded4a SHA-1: b930d8c8ffb0d3dabbe179b93a982c06f030aa9b SHA-256: 175e2984cf1be15dff53b87419c842f9151bce01ddb9eea8f33fbfe55b34f820
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites. The heuristics indicate a link farm strategy, with many distinct hosts hosting PDF files, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://krisoc.ru/uplcv?utm_term=watch+online+full+movie+radhe PDF link annotation
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/79659692629.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/22556961629.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/58569437715.pdfIn PDF document text
    • http://gapp.fr/medias/files/92119880157.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/22194885552.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/pujizazomokumofetanef.pdfIn PDF document text
    • http://keitbg.com/images/files/89835475027.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/86857451604.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/xejepemep.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/rizaxedalogeposeginom.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mge2i85lceeprs5f9qtjg89jnq/murogetozuwow.pdfIn PDF document text
    • http://polletnv.be/uploads/files/moxagugoginekalelenujobuj.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/55292661829.pdfIn PDF document text
    • http://exosushi.com/uploads/files/folafofipiwunozeji.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c70ce3f4632ce63bda5782bed77faa64/73397324142.pdfIn PDF document text
    • http://52963566.com/upload/file/202109040556243067.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161424ec6bee96---54552457597.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/sikokifexuliwegomuzok.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/63544620984.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/66659988143.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421f46d4a11---xowotumezex.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210917182615.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c99d60834---86963007821.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/kurigelavadizujawuj.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/3606937130.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3feaebcbc---7403255169.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/85080201040.pdfIn PDF document text
    • 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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 14496 bytes
SHA-256: 207eb94a137ef8b0ea2dcdf897b5b8813ba6674e741ebdb6ecda460944b36d75
font_01_sfnt_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 10732 bytes
SHA-256: 070e51d71e7023a3724e7cfa29b1c4623f486aa40c54af72bcd87e3e8ec6bae2

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