Malicious PDF — malware analysis report

Static analysis result for SHA-256 7103fb55d5b318ab…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 03:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02cc15e104796c7a026efdf8bc69fbf9 SHA-1: 124fcfb6ae677f59f89d5c6fdb9449190fe12635 SHA-256: 7103fb55d5b318ab8dd584d6cd9be7da80e4508e6dd53ba195c1340ac6c386f2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ooobelkom.ru/ckfinder/userfiles/files/punakijiwibowetujuda.pdf In PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/74709563689.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6526c849caad4a9afe6bfb83b7f8d996/82608950517.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/82427375806.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/2363137261.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109081855448860.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a7db194---44605816813.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/xevakugosewodonanozerep.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/44281621221.pdfIn PDF document text
    • https://dacola.com/upload/files/47424870806.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/xaparikabirodadufikomedo.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/bubakiniraponedo.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/98020705638.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/sigogubexixavi.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/30506908065.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jinazedirigaxa.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414c9aefea---sififotevekumasuvomenezon.pdfIn PDF document text
    • https://bnovum.hu/downloads/winuzagelizonure.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/rawanajosuwofagok.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/10056555938.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/jerakumesi.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/68633124985.pdfIn PDF document text
    • https://renewone.de/files/kupizetanaz.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/67992728221.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/93958685072.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/xomozewodesik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=office+mobile+app+for+androidPDF 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_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 18100 bytes
SHA-256: ccc1e33fe0b8f5c23c88adade5f06537c11a1934eda73dbb2823bd5039525a84
font_01_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 10680 bytes
SHA-256: 307a58534f1cfd8ebeb881d5f0e54d3ac543ea21658134fc9bdde02d6fc00092

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