Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dd60935b666c7e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 21:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed62e27253cae40bace0ac25de829a1c SHA-1: 25b0cdd48fc1c4f6c23fe30c6c9a1ba216e3fc81 SHA-256: 78dd60935b666c7e42912ecb71b57b04c784003b9c962560d605a023e9b54633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The primary purpose appears to be directing users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.urbanwaterways.info/files/9994308782.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc7bd0680---bixarufas.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129bc2c81f3b---72517684624.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/zepurufolero.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da08d953f1---32946597193.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/92843849060.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/9dcc8459838fd5cdef285ada9c31d1e2/71005644079.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/radokexesot.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wimej.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/47073025337.pdfIn PDF document text
    • http://sung1.com/upload/files/33787440285.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b571504fc---lobufufarunoxidufovib.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/80021373969.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/h0au2i9k24ufllhaje4k6pb044/4814106740.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107312001004049.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc29606e2f---9395769657.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/atdoqvdlc0v3lml16otmner8mp/44174811052.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/97ba3347f8cfe93589ff3c50736d1277/16361660954.pdfIn PDF document text
    • https://mmtours.si/uploads/85801105778.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f0cb7e1033201c91eade09d7308c43d8/26139532611.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8a987c6b---13131399863.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/rbs4o803jhnror6livrkot3scp/guligutorubutuvojujisi.pdfIn PDF document text
    • http://kingnature.ru/files/files/42446951192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sears+parts+direct+manualsPDF 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_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 10732 bytes
SHA-256: 93d71ca723c7dcf8bc3e4a23455bd2851d94c531aeb003d8e19dfa94ffd79ca4
font_01_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 18264 bytes
SHA-256: 30cc95952b3532c7fc8f089b24d245aadd82d0e9f18b0980e776f66cde6f8689

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