Malicious PDF — malware analysis report

Static analysis result for SHA-256 54325a774da0b0f4…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 03:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4fed11c80af87cdc0f76d9560a46e6d SHA-1: 5066fe910645394a97be22f2675f999b51272784 SHA-256: 54325a774da0b0f420d34f22af9af73c1f12604a4f31d77468f2b2c4043307b1
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 compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to potentially harmful external sites.

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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/24hp1oj0s54igihkqlahicsv2h/78844671657.pdf In PDF document text
    • http://www.majbrno.cz/uploads/files/82984742483.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/19653044337.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e684cd85946977c180f9e1cc6a29b63f/nuviwegur.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/durejofitakeko.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/gazowaxel.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/900e894d43d5f2cbdd14836328c6426d/93491109650.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/9142980956.pdfIn PDF document text
    • http://denge.aero/upload/files/54981844721.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/pofiwikifovipuwopab.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/xilumepaku.pdfIn PDF document text
    • http://jucal.es/images/file/63987414035.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/degejiwo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/96778142039.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/kikenal.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/73350667100.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cqbbln14th9n4e6m3i2b46k8om/1305659575.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fdfa942f2255da3a6302ddc804b02e30/fudumafegopefagi.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/90730138185.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/bapomaduxiduriwi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8574f7eb---femolulosidaserunefujufof.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wafedazifagiwakiwej.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/fatuzevawezipomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=catholic+daily+bible+reading+guide+2017+pdf+philippinesPDF 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_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 11628 bytes
SHA-256: d2180d1453e3b62c79b7c4b433521b48915b44ae70d71bfc837d40340ac3e23a
font_01_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 18020 bytes
SHA-256: 7b042d9f99df76998977a809f73a838b94b14eeaddb07029425d0d02a37711f3