Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e42a13070234bd…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 03:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 170b6bfa61f0e96b506dfb87f9193163 SHA-1: 3c133c1e58470aa6125947b377a5078de517a558 SHA-256: c5e42a13070234bd77e6b87d1b33c92725fcce7cfc610e1490a2f72ca67eef52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a URL with 'flight simulator download apk' in its query parameters, combined with the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, strongly indicates a malicious intent to deceive users into downloading potentially harmful files. No scripts were extracted, but the structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://flemingdecal.com/uploads/assets/file/24689418756.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/81320759716.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/41650926194.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/kazinitoxafifizazawud.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/pibatediwabug.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/54157465781.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/davofitoxijaduf.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wofelef.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee50fc4053---juzonisorabedolovepo.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/jotina.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/42591652485.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2a7a9c79---rododirudupibu.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/66692263319.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139445b835df---20322669770.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d06211f47---46428470180.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/lesuwaxewovetezerutarun.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/65317294175.pdfIn PDF document text
    • https://bor-diing.com/upload/files/taluvagojekixi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e876bbfc5---fuvumivoselozufu.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/81889884523.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/kogusunexezegozokebif.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/giretoxeminubap.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/30983352377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=flight+simulator+download+apkPDF 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_off0000cc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 10960 bytes
SHA-256: fcfcf166e5721dc33b33ff62b40eabc9d7d88c6246c688fc5c56b0257b870bf5
font_01_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 17336 bytes
SHA-256: 93670722d5735f7d8a31075d2979c339afe49a79cfbb7630d3c8ce219e5e0c8f

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