Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc877faaf6845f54…

MALICIOUS

PDF

75.2 KB Created: 2021-06-26 07:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78f5a2c597f3a8abb6372a30ae51f9fb SHA-1: 2dbbaffc1b7be5d4415ab90fe02980b0fe7a37cc SHA-256: cc877faaf6845f54604a7ad910ae896e751fcbda73416004c55bb854a366cdda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised websites and link farms, suggesting it is part of a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=the+oxidation+states+shown+by+hydrogen+are PDF link annotation
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabede7276f---kukusitofibamitokava.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/42053143339.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ac312519---99640306531.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/vimoxivobedobijusadel.pdfIn PDF document text
    • http://soupworld.de/upload/file/fenavosebakobe.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc97b4efb---28824522823.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/27659235605.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/10110998645.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a22d4ef98---51892060658.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/jedix.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/junoxasimotezagoteri.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160938d4509ed8---36024539863.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/pasavud.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3137c53fac9b58ce2bf2d368e24c3af3/27554029406.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f712df958---tosevewotituk.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1j96vqpjhuvq25rd81shab6hib/68415520818.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3381ac4629013c6f2e6df0d86e6b9fd4/nunelopevoxijurevozo.pdfIn PDF document text
    • http://chieucoingason.vn/files/24305659191.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e08390f3e---dupozilatomawutesu.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/57899288627.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/64962832190.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a292ab8ebad---36215244044.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c341fa3d2c---51613768606.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a7591e6e8b6354ca6592b9306580b9b3/zodikutexol.pdfIn PDF document text
    • 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_off0000c42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 16196 bytes
SHA-256: c390f92f062015c353d9b8cde0fabd2faa567e1604339a602bf6c205ad1b71ba
font_02_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 10888 bytes
SHA-256: 8fd1b651ea89072f032aa305b256dd9f93660500dc41cdf9a42c87f9e0cce254

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