Malicious PDF — malware analysis report

Static analysis result for SHA-256 62600b5d1f030cf6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 05:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ae1121eb6886747682ff8c788a33784 SHA-1: 28e65d44f092c8b1af93f37a449de10cb040aea4 SHA-256: 62600b5d1f030cf6c37350ad957a8c384a3f63277a7c364045bc8378698a1a60
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/20418536227.pdf In PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/mafegexajojokowavobip.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/pimefi.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/4369821753.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/76470645456.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137cbf714fe5---53989494424.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/danomupodalobeti.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/negobofavuludifenifure.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/12361369534.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312bf60adea---xazajopedabemesoromofufa.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/zebafomavutojiranovevek.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/91363354190.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f657c6ab3---gupofadelumuse.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/94918708001.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/sufibevof.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109100109478277.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613785b1f2217---mujuwewobetibap.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/dutolexaze.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/60151220111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=write+an+equation+in+vertex+form+calculatorPDF 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_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 10736 bytes
SHA-256: 730fdb3d1575b6d0689fec9a27ebeb874d06f5bbcde8ed9f874b95259fbe4f9f
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 19188 bytes
SHA-256: 6bd8b22cca58132fa9ccbe7cf78a28ac1975e868df730c76a957740a5720e513
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1