Malicious PDF — malware analysis report

Static analysis result for SHA-256 531388b26d1c4113…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 08:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4744d8855e87df1b0325882f5711f752 SHA-1: f2f6a121114ed46d671395ec765b8553da1dabfa SHA-256: 531388b26d1c4113f1b70b6b632591da8175009896ce78dc84efa7f4cb9e4d00
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://queure.ru/uplcv?utm_term=redmi+note+9+pro+home+button PDF link annotation
    • https://infypos.com/infyposcms/media/59220260443.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/zaxivifesixopi.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/82131494937.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613030976c402---zakawuxadoxubifenuzudu.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/57261963469.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/42221135471.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/bezupilavejug.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/xunalejulumofefudele.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/goxudomivaporosozumanikil.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/dupotawemola.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/jobusovajozidagifojubog.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/tewediwanufozaziriz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad03cb24c---kuxisesovulim.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/xegirunojalugopusesox.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/polawagur.pdfIn PDF document text
    • http://pnalog.ru/images/file/xogaloxosogibejituvagomut.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302eff59efa---vokenizetafowusefuzumavem.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/85481442132.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021914110288975.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d4da3182---pudororo.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76122769109.pdfIn PDF document text
    • https://purefeeling8.com/data/file/15771354180.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/tixolotabonena.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/lafisarosapa.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_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 21648 bytes
SHA-256: e7d030a6c736640b29b9a5bafed49605440ed405842243f377f2d685eb84f7b2
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 10736 bytes
SHA-256: 0cdf79fc1fc07834eb93e8e5b5dcfcfe9b6247e737b4b5ec6dd88987cedf4c17
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.