Malicious PDF — malware analysis report

Static analysis result for SHA-256 c261bc4d8bf8e4f7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-23 22:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 698128dd86f5d64bbf6cfbbfb5ef987b SHA-1: 9373e5102e372062256e79ac76cfebcdeaa20ca4 SHA-256: c261bc4d8bf8e4f7f51796ac59ecd15b9f414a26337ad7972fb799b514e78d07
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm indicate it's likely used as a lure to redirect users to malicious content.

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 https://korovin.org/site/img_ufiles/sexufikadowenabage.pdf In PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/54360499136.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148e46a1a553---29964102735.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a28152618---57181670225.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/37094648171.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/sdvsulrupvrqj5udq3rrvrg6lc/98302537159.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614359ada1c64---55952492552.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/32985955330.pdfIn PDF document text
    • https://maisonforville.be/documents/file/petexemaz.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/vogulufajegedobazebo.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/vopixekebebonulud.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/42665741953.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/basuruzutik.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109030434366637.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf438298c---65937122989.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/9681165040.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/zozotesilid.pdfIn PDF document text
    • http://hidropro.hu/upload/58813228560.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/62626851141.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614406ce4d5cd---84599441543.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/raxatekujej.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/nemolasepixababog.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/88546728325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=recyclerview+kotlin+examplePDF 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_off0000bd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 10872 bytes
SHA-256: 76fd9c3c25726306e410dce2c0e185c4049c1fd7237565e04e79cb22f52e637e
font_01_sfnt_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 17116 bytes
SHA-256: 819f275ed0ff1c15b115aa194486c97f63ce1d8ff54e07e106070605bd29dcf0

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