Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bbc157e813cd3c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 01:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 888bb44263a9cde11ae1165be5908805 SHA-1: 1e4f21d92c4676eeee4c845ad1ae0a396d4de1ac SHA-256: 25bbc157e813cd3c5e84bb69058300b9b9474ddeaf89fd82a0c467501c03567b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are confirmed benign, are part of a larger pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.focitabor.hu/userfiles/file/23053782514.pdf In PDF document text
    • https://leganordavigliana.it/uploads/file/37078577865.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/2863261123.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143394742293---24369939208.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/45712561700.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/15125384444.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/10709622904.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-12/20210912015345146997.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2c23e89c9d2adec300f36b0876aab373/kobonupexegika.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/46200982577.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5fe7c164---37566313067.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/86877550288.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/pazedemajavufi.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/67788701826.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/sopoduzexugigesujepor.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109021416238474.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/29745085120.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/maponafud.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/47756644299.pdfIn PDF document text
    • http://373113.linker.tw/files/rejaxovekat.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/xoxifodobufudejizovom.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/biwirupusus.pdfIn PDF document text
    • https://proia.bg/userfiles/file/48190139602.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/62775241402.pdfIn PDF document text
    • https://kultmotor.hu/images/files/lugepudozusixileriverufi.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/71780420869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=norton+android+apkPDF 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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10108 bytes
SHA-256: 81c9bfcbbb719eb6d32e36a09b82d772c22baab6f7b09031ac4c7f29f5ba9793
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 18624 bytes
SHA-256: 02f6de7db3fbf55fafb2b5b302d22ec9f2290693475268324e5cecbc6f55b63c

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