Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1be9c187eb981b5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 14:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7df82572d1443a12babe3b0ada41931 SHA-1: d53824ce49e0e9a874746d74be4d855fd26f9338 SHA-256: c1be9c187eb981b5ebabd4728f353111baedad4b7aa452ff9c802680802a0707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

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://infrive.ru/uplcv?utm_term=case+studies+in+immunology+7th+edition+pdf PDF link annotation
    • http://soyaksiesta3.com/userfiles/file/xevugevuvexinuxu.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/vuvegi.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/tajedafiret.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7df70180---89926626181.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tojufavujepexeriz.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/sipimete.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a32cd6e7---1094156229.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/kokitijefajudagesojogike.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/91869660417.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/mirunejemaviv.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/se5pe12ibisa1t16a51vib0fr1/xinuxosoruruvojanijas.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/dasaludusup.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/38390171452.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/35194615575.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/lemevowibewodoxufifera.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/wibunukalibomumakeg.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/30181337410.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/22650072679.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/26656692817.pdfIn PDF document text
    • https://gangnampools.com/contents/files/66477447031.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/nekoxivuzevibogutag.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mavugirazobumimaleku.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/gujevilikekejebuner.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_off0000c368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC368 11140 bytes
SHA-256: 63bc1808380e7d69379c07d7a8ebd4d54429d1f28c9edbe2c89811051c65ec59
font_01_sfnt_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 17008 bytes
SHA-256: 1e4c57adf44bc42f4919bff165b65097538499faf22f7e6c80d1e6a43dec6721

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