Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdee6ff2e0c5202…

MALICIOUS

PDF

87.6 KB Created: 2021-07-09 05:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3280df5a7358f0f22adb27ac906c1f0 SHA-1: ff878f2399a38f0332694edaf641526a17971c67 SHA-256: cbdee6ff2e0c5202f2a6691f1d858eabe57b1e16dd41ee31b460edf8e6720887
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, many hosted on compromised CMS platforms. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076088aeced4---pomakewalosorodome.pdf In PDF document text
    • http://axwelindia.com/uploads/42825506069.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/75103502386.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/vukujovisavemizugu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608eb81589cb3---86152252094.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c72de5adcf975c2de2d09aec142369ac/64996208373.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/n59ag9fobtc7v9j8rdak56bfdn/60195859614.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kccll6raipbm3vovefmivq65ld/79729589596.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/fazavawosawenesikidejewu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160858c0739f75---83777540280.pdfIn PDF document text
    • https://noddy.nu/images/file/76873199375.pdfIn PDF document text
    • http://digifast.cz/userfiles/28862836590.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/88114216459.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/majs7uk6da625fgrf5cu2hr8o4/94268978912.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/145be149ab3f031521617355c6ffa7dd/54211085342.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/67456950547.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077d13603a2a---sotowujura.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/bce6bfeb4053377284f40c237792bc00/7178697331.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/it5vtft1asn5qmprrl1pso223s/16361004795.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/47430531218.pdfIn PDF document text
    • https://fallsplat.se/file/wukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+order+to+watch+the+marvel+filmsPDF 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_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10784 bytes
SHA-256: 3e25e22de624dfa9b06ab8765eb809a158d4be68bf9aff34099e3bd73ce624b8
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 17596 bytes
SHA-256: 53393325d2fc0bf3cb053ad2ccac532f18aa9e7a04f488a4de40a24fd35b2cc6
font_02_sfnt_off0001392c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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