Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f887ce6d5f0e24d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 23:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a1f204069558a65db69e6bc4c082f86 SHA-1: 12fe829a0c010e9f968b70eacaf05f22075861c7 SHA-256: 0f887ce6d5f0e24ddac39825735d38b18b23c66cba9bb1f6b2c86432af50d3d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for SEO manipulation or to distribute further malware. ClamAV and ML classifiers strongly indicate malicious intent, and the structure suggests it's a phishing or malware distribution document. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ceiling.holcom.vn/webroot/img/files/75574397224.pdf In PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/14007621509.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kerore.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/mexinubozuzubewoduta.pdfIn PDF document text
    • http://signauction.net/userfiles/file/42284008908.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/batuni.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/fefinefizukaropegenoj.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f7ceaf7622bd04478efe51ba28aae103/gebinib.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/44740874369.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gevagobekarerixetanowuri.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b3c06348fca311854fcd9ee790ff7bf1/lijelizu.pdfIn PDF document text
    • http://shopabrang.com/images/files/9340441998.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/kosafededalewo.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/53145567984.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/korer.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/sebazutazimepizaje.pdfIn PDF document text
    • http://fgosvo.ru/files/files/54264624413.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/70478127118.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bipixatenimadozavedeb.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/1491761975.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354b51ee9c3---robasijidibod.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161458a74267f7---nelokakejixarititin.pdfIn PDF document text
    • https://expomediainc.com/upload/file/besapiwujilalifedegul.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/rezefuwewamabogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=good+story+games+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_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 10696 bytes
SHA-256: 7101f2fe5a8e91e54de06137f97d5b701e0847c3ef887ec0b4323c0c7a588752
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 17172 bytes
SHA-256: 91377cc4e01f1986a1025decfdd4957d7935e335daf305518db316237497470f
font_02_sfnt_off0001348b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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