Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0af781f170d8b2…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 19:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f681fa3d51192c86901ab5ab530a5100 SHA-1: 6682871377dc7e052ee342ba7d427b9413adcd12 SHA-256: ea0af781f170d8b28b4bd4c96898470a2d29c75735c09dc64c1c921c9459451b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URIs were found, including links to compromised WordPress installations and direct IP addresses, indicating a likely phishing or malware distribution attempt. The document body was unreadable, but the presence of many links suggests a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dreiseengrundschule.de/files/30187217091.pdf In PDF document text
    • http://nhadep30giay.com/uploads/image/files/47359088995.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3f69f152---xepebakitubepumelisolaro.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c545727b2---54819458342.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/poxedugabazunuzikarexo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/vukejuf.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/74232792009.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rceufike2lsenctj3fbhfjvdj1/nizalufagikafi.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd58acface---kigikafuretevifuguxaninu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e504e547---minegedepopurotuzov.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/823mc7mj8eq7vg4ui9dv77a7c2/87216619271.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/61902228891.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9d638836---setitodapazolo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2b69c3576---88580678124.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/77645791682.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/lakilitiriwoxuvu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c5d005f6---lipafinebosogi.pdfPDF link annotation
    • http://akkoryazilim.com/userfiles/file/56476570269.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/derewi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795fb969f93---venaz.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/98743983924.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/79803211421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=amharic+to+oromiffa+dictionary+pdfPDF 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_off0000bac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC8 18912 bytes
SHA-256: c498db0c636bd03b6eb1ca26175b888d331005583151ee9dd22e3b1d81c2c1c1
font_01_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 10636 bytes
SHA-256: 426861e759bf448fd4fe5f3130e2ce1f355e7083e6af89fd2c531e3e6fb5fb3d
font_02_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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